US WTB: Sega Development Hardware

Some of you may know that I'm a huge Sega Enthusiast and I'm getting closer to a full Genesis library. By profession, I'm a Software Engineer. I would like to start doing some development on the Sega platforms and I want to do it the way it was done when the system was release (for Genesis / Mega Drive, this means 68K Assembly). I plan on also doing some tutorial videos on my YT channel once I'm able to obtain the hardware. I'm primarily looking for DEV kits for Genesis / Mega Drive, but may also be interested in other Sega platforms. I have a computer from the mid 90's that I will be doing the development on, so I'm really hoping to obtain the ISA Cards to do real-time debugging.

Some examples of what I'm actively looking for include, but not limited to:

Cross Products Mega Drive / Mega CD Dev Unit
SNASM2 Mega Drive
SNASM2 32X
PSY-Q Mega Drive Development System
EA SPROBE
ZAX ERX

Any leads you can provide would be greatly appreciated. I have an ebay watcher set up to notify me if one ever pops up, but that is rarely the case.

I will gladly pay any international shipping and import charges. I'm also willing to trade some items from my collection for any of these units.