Try looking in at the Ebay musical instrument auction page for used mandos, or some of the other on-line sellers. I know some new ones can be had (Musician's Friend, AMS, Elderly Instruments, etc.) for around $200, so use ones may be found for less.

Here's the URL for Ebay's Instruments page:

http://listings.ebay.com/aw/listings/list/category619/index.html

I probably have the URLs for some of those others, too:

Musicians' Friend:

http://www.musiciansfriend.com/

AMS:

http://www.promusician.com/

Elderly Instruments:

http://www.elderly.com/UIL.htm

Good luck.

Bob Clayton