They are expensive..about £60 if I recall. Doubt if you'll get anything like this on Eblag, so it looks like a fellow tosser to supply or the usual moto- bins/works etc
Excellent service from Euromotoelectrics, they make some interesting bits, I had an excellent magnet body for a Valeo starter which seems to cure the 'magnet falling off' problem, currently road testing it on a high compression engine, excellent so far. EME prices are quite good, but postage isn't necessarily cheap!
I have found the US post charges to be reasonable and the service good with the standard service.
Paying the extra for the premium service doesnt seem to make a lot of difference.
If you are looking for the Hall Sensor BMW Boxer Parts has one already mounted on a backing plate at a reasonable price.