I can highly recommend Photostudio 13 in Germany: www.photostudio13.de .
Excellent professional quality (dip and dunk machine; Kodak Q-Lab quality control) at very reasonable prices:
4,31€ for 135
3,75€ for 120 (both without VAT).
They develop E6 every day, and your developed films are sent back to you just after developing the same day.
They also do shipping to other countries.