You know you could make your own beads too. With filo dough and there are other mediums also, filo is the one off the top of my head.
I would shy away from the dollar store...lead paint recalls and all...JMO
My advice is to check out ebay and etsy...you can get some really nice beads/stones for a great price and have quality items you can then sell on
www.etsy.com (I love that site :)
I think hook earings would bring the most income, again JMO...they are really popular right now and would only need one bead per earing (sometimes)
My advice would be to check out etsy and get some ideas!
Good luck and Keep us posted :)