So I'm looking to buy my first strop and eBay seems to have a pretty wide range of things, I know not all strops are created equally but with that said, how do you guys recommend I go about separating the ones that will get the job done from ones that'll ruin my razor.

Note: I'm a student (pronounced "poor" haha) and eBay appears to be the cheapest source for strops, if you guys have a suggestion or a place I can get a good strop cheaper I'm all ears

Any suggestions would be immensely appreciated