I love Inque Boutique they are inexpensive ($11.75 for 17 stamps) and if you are just starting you don't want to spend a lot of money until you know if you like it. They also have some great swirls in matching chipboard.
Here are some samples:
Lots O Dots
This one is only $3.15 can't beat that.
I ordered a bunch of these because I never used unmounted before and I am very happy with them.
Good luck in your search.