Bit of a problem there... I can't reach Pactron's web site at all, so I don't even know if it's the same company or if they're even still in business.
The ONLY 32MB Flash 72-pin SIMM I've been able to hunt up online is one from Cisco Systems for an old model router (and I don't think they even manufacture it anymore, this is left-over new stock). But I have no way of knowing whether it's even compatible.
Anyway, the one place I've been able to find it is here
http://store.majormemory-com.com/mem-381-1x32f.html, and there's a nice picture but not real information. $113 US
The same unit is available from an online shop in the UK... for more than 4 times the price, so I'm not going to bother showing their link.
The problems seem to be:
a) nobody uses 32MB (or 16MB) SIMMs anymore
b) very few people even use SIMMs at all anymore
c) all the flash RAM being manufactured is in the form of things like Compact Flash cards and such, which does us absolutely no good at all
Oh well... while it would have been nice to be able to author a sound RAM on the Ultra to swap into my PX-7, it really seems to be far more work than its actually worth.