SCMSs were reviewed in Popular WW (IIRC) this month. One of those that they took a look at was a $200 cheapie. They said basically that if one didn't use it a lot, and if pinpoint accuracy wasn't a biggie, this might be an OK buy.
I noticed in the recent Harbor Fright mailing that they had one that looks suspiciously like the one in PWW for $99. Take a look at