You should look through older posts, I am pretty sure this was a topic recently on what vendors we all liked for paper liners.
I get my white ones from Restaurant Depot. It is about 500 for under $5.00. Some also, mentioned Ebay if I recall. I've never done that but who knows. The price may be great but check the shipping cost which end of higher than you want to pay. Look into Candyland Crafts too.