Just like you found that B4!
EBAY!
http://www.ebay.co.uk/sch/i.html?_nk....c0.m270.l1311
http://www.ebay.co.uk/sch/i.html?_fr...All-Categories
http://www.ebay.co.uk/sch/i.html?rt=...=p3286.c0.m283
or try HOBBYKING
http://www.hobbyking.com/hobbyking/s..._10_1_12_.html
http://www.hobbyking.com/hobbyking/s..._GENUINE_.html
http://www.hobbyking.com/hobbyking/s...Approved_.html
If you don't want to sponsor your local shop (or don't want to spend more than your 125), otherwise, ALWAYS SHOP AT YOUR LOCAL LHS.
There are some real good ones out there! je spares, mkracing, apexmodels, dms, ... just to name a few!
Maybe the prices aren't always as good, but the advice and service always are.
(My latest top webseller is hk modellbau, but hey Germany is easier to drive to than UK if you live in Belgium like me)