Hi Phil,
I'm pretty sure the Isonics on Kammy goes for around £250 these days.
The Jokers on Sko-Feld and the Nomads on Mo-Groov probably go for between £700 - £1,000, maybe more! I'd also be grateful if anyone has a current price tag on both of these, out of interest.
Test pressing - do you mean original, or re-issue test pressing? Both the Jokers and Nomads were issued on Goldmine Sevens - if that's what you mean, probably best to get in touch with Tim Brown via his website (don't have the URL, but I'm sure someone out there will help).
Gene