Looking for something, i think it's called booktroll?

About two years back i was buying and selling books on amazon.com, but i was also in this thing that i think was called booktroll, but i'm not sure. Okay, so, what i did was text the isbn of the book to this thing and it texted me back whether to get it or not. If i got it i would send ten books at a time to the company and they would pay me for the books via check. I can't remember the name of it but if anyone knows what it is or anything similar please let me know. Thanks.