Here is a list compiled by professionals during disasters all over the world (Foreign and Domestic) that has been worked down to reflect what would likely be the goods/supplies/etc... that would vanish from the available market the fastest in a major disaster or lasting period of unrest/chaos etc...
It is also kind of a list of what you may want to think of acquiring in advance.
1. Generators (Good ones cost dearly.)
2. Water Filters/Purifiers
3. Portable Toilets
4. Seasoned Firewood. Wood takes about 6 - 12 months to become dried, for home uses.
5. Lamp Oil, Wicks, Lamps (First Choice: Buy CLEAR oil. If scarce, stockpile ANY!)
6. Coleman Fuel. Impossible to stockpile too much.
7. Guns, Ammunition, Pepper Spray, Knives, Clubs, Bats & Slingshots.
8. Hand-can openers, & hand egg beaters, whisks.
9. Honey/Syrups/white, brown sugar
10. Rice - Beans - Wheat
11. Vegetable Oil (for cooking) Without it food burns/must be boiled etc.,)
12. Charcoal, Lighter Fluid (Will become scarce suddenly)
13. Water Containers (Urgent Item to obtain.) Any size. Small: HARD CLEAR PLASTIC ONLY - note - food grade if for drinking.
14. Mini Heater head (Propane) (Without this item, propane won't heat a room.)
15. Grain Grinder (Non-electric)
16. Propane Cylinders (Urgent: Definite shortages will occur.
17. Survival Guide Book.
18. Mantles: Aladdin, Coleman, etc. (Without this item, longer-term lighting is difficult.)
19. Baby Supplies: Diapers/formula. ointments/aspirin, etc.
20. Washboards, Mop Bucket w/wringer (for Laundry)
21. Cookstoves (Propane, Coleman & Kerosene)
22. Vitamins
23. Propane Cylinder Handle-Holder (Urgent: Small canister use is dangerous without this item)
24. Feminine Hygiene/Haircare/Skin products.
25. Thermal underwear (Tops & Bottoms)
26. Bow saws, axes and hatchets, Wedges (also, honing oil)
27. Aluminum Foil Reg. & Heavy Duty (Great Cooking and Barter Item)
28. Gasoline Containers (Plastic & Metal)
29. Garbage Bags (Impossible To Have Too Many).
30. Toilet Paper, Kleenex, Paper Towels
31. Milk - Powdered & Condensed (Shake Liquid every 3 to 4 months)
32. Garden Seeds (Non-Hybrid) (A MUST)
33. Clothes pins/line/hangers (A MUST)
34. Coleman's Pump Repair Kit
35. Tuna Fish (in oil)
36. Fire Extinguishers (or..large box of Baking Soda in every room)
37. First aid kits
38. Batteries (all sizes...buy furthest-out for Expiration Dates)
39. Garlic, spices & vinegar, baking supplies
40. Big Dogs (and plenty of dog food)
41. Flour, yeast & salt
42. Matches. {"Strike Anywhere" preferred.) Boxed, wooden matches will go first
43. Writing paper/pads/pencils, solar calculators
44. Insulated ice chests (good for keeping items from freezing in Wintertime.)
45. Workboots, belts, Levis & durable shirts
46. Flashlights/LIGHTSTICKS & torches, "No. 76 Dietz" Lanterns
47. Journals, Diaries & Scrapbooks (jot down ideas, feelings, experience; Historic Times)
48. Garbage cans Plastic (great for storage, water, transporting - if with wheels)
49. Men's Hygiene: Shampoo, Toothbrush/paste, Mouthwash/floss, nail clippers, etc
50. Cast iron cookware (sturdy, efficient)
51. Fishing supplies/tools
52. Mosquito coils/repellent, sprays/creams
53. Duct Tape
54. Tarps/stakes/twine/nails/rope/spikes
55. Candles
56. Laundry Detergent (liquid)
57. Backpacks, Duffel Bags
58. Garden tools & supplies
59. Scissors, fabrics & sewing supplies
60. Canned Fruits, Veggies, Soups, stews, etc.
61. Bleach (plain, NOT scented: 4 to 6% sodium hypochlorite)
62. Canning supplies, (Jars/lids/wax)
63. Knives & Sharpening tools: files, stones, steel
64. Bicycles...Tires/tubes/pumps/chains, etc
65. Sleeping Bags & blankets/pillows/mats
66. Carbon Monoxide Alarm (battery powered)
67. Board Games, Cards, Dice
68. d-con Rat poison, MOUSE PRUFE II, Roach Killer
69. Mousetraps, Ant traps & cockroach magnets
70. Paper plates/cups/utensils (stock up, folks)
71. Baby wipes, oils, waterless & Antibacterial soap (saves a lot of water)
72. Rain gear, rubberized boots, etc.
73. Shaving supplies (razors & creams, talc, after shave)
74. Hand pumps & siphons (for water and for fuels)
75. Soysauce, vinegar, bullions/gravy/soupbase
76. Reading glasses
77. Chocolate/Cocoa/Tang/Punch (water enhancers)
78. "Survival-in-a-Can"
79. Woolen clothing, scarves/ear-muffs/mittens
80. Boy Scout Handbook, / also Leaders Catalog
81. Roll-on Window Insulation Kit (MANCO)
82. Graham crackers, saltines, pretzels, Trail mix/Jerky
83. Popcorn, Peanut Butter, Nuts
84. Socks, Underwear, T-shirts, etc. (extras)
85. Lumber (all types)
86. Wagons & carts (for transport to and from)
87. Cots & Inflatable mattress's
88. Gloves: Work/warming/gardening, etc.
89. Lantern Hangers
90. Screen Patches, glue, nails, screws,, nuts & bolts
91. Teas
92. Coffee
93. Cigarettes
94. Wine/Liquors (for bribes, medicinal, etc,)
95. Paraffin wax
96. Glue, nails, nuts, bolts, screws, etc.
97. Chewing gum/candies
98. Atomizers (for cooling/bathing/breathing machines)
99. Hats & cotton neckerchiefs
100. Goats/chickens