I agree with Peter's recommendations for commercial electronic (print yourself) kits, and would add
www.bestpapermodels.com to it. Check out our links section for other sources to peruse and evaluate. If you wish to work with preprinted kits, I highly recommend Orlik
Orlik Model Kartonowy, Sklep internetowy. The kit prices are quite reasonable (one Polish Zloty is about 30 cents US), airmail postage from them (registered, no less) is comparable with postage handling costs from domestic sources (those few that are left), and delivery is usually no more than 10 days after making payment to them. Unlike most eastern European vendors, there is no language barrier problem, and the proprieter is great to work with. We also have a domestic kit distributor
www.papermodelstore.com that appears to still be in business, although no updates have been made to his website in over a year. Welcome to our world of high-tech paper dolls.