I asked this question only a few weeks back am I invisible.
Because I am in Australia and have high shipping rates I buy them off ebay that way I know the cost of everything straight away, I have found they are still around from other hobby shops some advertise here, last year I bought 50 sets off a store in Sacramento Cal forget their name I just bought 15 sets off the Bay I have bought over 250 sets never bought them at a discounted price but you might have better contacts than me I'm not complaining I got what I got and I'm happy. Roo.