We use a trade printing company to prin our stuff. We used to use CafePress but their quality went down hill REALLY quickly.
The place we use now is 4over, but you have to prove to them that you’re a legit business with your own domain and all this for them to even take you on as a client. But their prints are consistently beautiful and rarely late. If you are able to be taken as a client, they are well worth it.