Try Bill Wolfe at Brookhavenrecords.com.
Hmmm, well purple on white would be a problem. Real ones will have red or black print on a white label. I did have an extremeley rare one sided promo with cyan print. If you can send me a scan and tell me what is stamped in the trail out vinyl (not hand etched), I can tell you about it. Note that it was counterfeited in 1982. Tom