I've used Wiggle with great satisfaction and my-son-in-law has used PBK and Ribble also with equally good results. I've never used any German sellers and was just quoting jimc101's recommendation. Hartsu has provided several German sources but I have no experience with them.

BTW, UK sellers have low prices and are reliable but don't order anything you need in a hurry. Sometimes delivery is extremely fast, three or four days, but sometimes thing get hung up in US customs and delivery can be weeks. It's unpredictable.