Where do you buy your singles ?

I'm new to the hobby. I did it like 15 years ago, and I try to start again.

I look for some single on ebay for my PC, but everything I want are on auction and the price go way up high of my budget right at the end everytime.

Where do you buy yours ?

Just for info, I don't have a card shop in my town, I live in a little place sonit's not a possibility.