I saw that you registered on the board, so you could post a used part wait list request at:
http://azure.bbboy.net/190revolution-viewforum?forum=15

There are other used MB parts sources, so putting out feelers at places like silverstar recycling, bills used mercedes, etc.

Last time I checked, a new OEM dash ran about $400, so I went with the Palco dashtop for $120 from Capitol West, but if I was on the mainland and within UPS ground shipping of a reputable parts supplier, I would have gone for a good condition used dash.