Jen- I bought the pellets on ebay. The seller is Thinxis and they are homeopathic. They cost $44.95 plus free shipping for a 40 day round. What I did was I ask one of the buyers who gave feedback how the pellets were working for he or she and they said great so I took my chances and ordered from them. They also have some you can bid on. They have been great for me and will purchase again.
If you do a search on ebay for HCG pellets, Thinxis is the only site so far selling them so should be easy to find.