Fralins are available here, about the same price as the SDs.
Davie - I know nothing of neodymium bar magnets - what sort of thing do you mean?
Another option, and I have been completely dim here - I've just sold a Retrovibe P-30, which was a short scaled 50s style P bass, and one of the things I really liked about it was the tone - from the Retrovibe own make 'Route '51' pickup. This is a 9K output and the tone is what I had in my mind when compared to the Roswell. they cost £35, so around 1/3 the price of the SD or Fralin.