We all use the same vendor, and have the same items available to order, but obviously different groups budget differently for this. This wouldn't be as big of a deal if it were one or two people a day taking one or two cups of coffee, but that's sadly not the case and it's eating pretty substantially into our supply - we went through a box of peppermint tea in less than 2 days, and over 300 single-serve tubs of creamer in less than a week.
May be you want to cut back on the various refreshments on offer. That might limit those who wander to other floors looking for something new to try. I guess that's what happens when you offer freebies to employees...sadly they take advantage.
