Making a profit from selling online

Hey everyone

I'm currently attending college and am looking to make some extra money selling things online. I'm looking to shoot for maybe $100 profit off every batch of products I sell. At first, I planned on selling designer jeans online through ebay. The problem i've encountered, like many others, is that I cant find someone to sell them cheap enouph to make a substantial profit through ebay.

So, do you guys think my profit goals are obtainable being a small time seller like me. Also, do you think what I plan on selling is a good idea, if not, do you have any suggestions as yo what I should do instead?

Thank you for whatever help you can provide

If you buy them in bulk like from liquidation.com which does carry name brand designer jeans you can expect to make a good profit, but the downside is you have to put up more cash up front.