Hi Dave,
If you deal with the north American souces you will get a break on shipping costs from England. The dealers consolidate shipments where you would be paying for small individual orders. On the west coast most brick and morter dealers have closed. Rabers (Bob and son Mike) survives in San Jose which is where Phil Radford (Fair Spares America) is located. Phil is a mail order operation only. As was mentioned Phil got his start with Les Em and Fair Spares, hence the name of his company. Local guys stand behind their parts and that makes them a valuable source compared to one 6,000 miles away in another country. You can tell Bob and Phil are old friends