We used to charge a fee on nearly every invoice of 5% with a max of $10. Then it was brought to my attention that this is not always necessary or appropriate, and after I thought about it, YEAH, it’s not! I decided that charging some sort of random indescriminate fee was not right and we dropped it out completely several years ago. My cost for uniforms, towels, tp, water, and the like are not billed as “supplies”