The power supply can be found for less than "very expensive"
http://www.impactcomputers.com/661-...loxKpka_T9HzRU6iN7bBLTPv0NuLD4Mc2saArW88P8HAQ
Using another supply is possible, I suppose. The tricky part will be the power connector plug. It's a little unusual.
And, I don't remember seeing the pin-out for that connector.
According to this - the adapter is 18.5vdc, although I suppose part of the output is going to be 12vdc.