I like this smart money clip a lot -- holds a drivers license and about 4 credit cards and about 30 bills, plus it's safer from pickpockets in the front pocket, not real bulky.
here's the link:
http://www.protravelgear.com/store/Accessories___Travel_Aids___Smart_Moneyclip___71?Args=not affilliated with this site, but I did purchase the product from them