Probably not $25.00 -- that's actually quite a bit less than our BOM cost, not to mention labor, overhead, etc...
I'm trying to see now if we can offer the upgrade for $50.00. But it will probably be closer to $65.
Mine is in for a warranty replacement already - that's pizza for a whole week!
$65-75 sounds about right - It would be a very nice option for any non- warrantee replacements yet being enough to discourage people just sending in old MM's and canablizing new ESC sales...
Have you considered an option for turning a working MMM into an MMPro? I've got an MMM for a CRT.5 that I'd love to turn into the smaller MMPro for space reasons.