I looked hard and eventually found a really good place in Cardiff called
Antics. They were one of the cheapest places I found and if you are
ordering more than a few (10 plus - and you talk to them nicely) you can
get a small discount which should at least cover your shipping costs.
http://www.xcprod.com/titan/XCSB - optimising PIC compiler
FREE for personal non-commercial use
If you just want one or two for now, your local hobby shop might well
work out the cheapest - even if they are a bit more expensive there's
no postage. I like HiTec servos though there are many other decent
ones. The HS311 is their regular standard-sized servo. If you want a
ball-bearing on the output shaft - good for dealing with the
side-loads incurred by mounting wheels direct to the servo - the
HS325HB or HS325BB (slightly newer) would do the job. The Futaba
equivalents would be the S3003 (no BB) and S3004 (with BB).
For maximum convenience, Active Robots sell servos, including some
pre-modified for continuous rotation, and handy mounting brackets:
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