Three pages of MT2500 stuff on ebay including a MB module: http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2417094370&category=43989
I was a little surprized at the prices they were getting for whole sets. I still think an older one without a bunch of other stuff will be had for near 500. The module is less than $50 right now. I wouldn't think it would go for more than a few hundred.
Bosch Master, ASE Master, L1
33 years MB technician