Where to buy "paid" stickers

I am looking for a source for round or oval orange or red stickers that have “paid” printed on them. I’m not having a whole lot of luck googling them. I found a couple but prices seem to be in the nickle range but I’m sure I should be able to get these in the penny range. Looking to buy anywhere from 10,000 to 20,000 of them. Any ideas?

Never mind, found them on ebay for 3/10 of a penny.

Darn, I was going to give a deal of 12.00 per 1,000 for 20k…But I see my price sucks…lol…

Not sure if it would work for whatever you are using them for but you can get a stamp that reads “PAID” at any office supply store and I’m sure it wouldn’t be any more expensive per stamp vs the sticker. Just a thought!