I do the same thing at my work, but I have an honor system where people can keep a tab on a notepad. I buy everything at Costco as the prices are about 1/3 less than what you see on amazon. I round up to the nearest quarter to make life easy for everyone. I have a slightly different selection as well. Below are some of the hot items not listed on this post:
Nature Valley Bar - Protein (Peanut Butter & Dark Chocolate).
Individual Kirkland Trail Mix.
Individual Tropicana OJ.
Premier Protein Bars.
Premier Protein Chocolate Drink.
Lara Bars.
Trio Bars.
5-hour energy.
Cheese Sticks.
Vanilla Whey Protein.
My go to meal is Quaker Oatmeal mixed with Vanilla Whey Protein. I'll eat that 1-2 times a day. Cost for that combo is $0.75, not bad if you ask me. Just trying to give people some good ideas here :)