I keep stocked up on $5.00 Starbucks gift cards. There are Starbucks EVERYWHERE so I know they'll be able to use it, and when a transaction goes really well or it ends WAY higher than I anticipated, I toss one in and buy them their next latte.
Better than candy, but same thought!
wow, thats so nice! I wanna buy something from you!! I send little gifts too, I send handwritten notes and sometimes some samples of creams and lotions