97 blazer tccm ?

Does anyone know where i could find a new one for a reasonable price? I have a 97 2 dr blazer. Last year I had a problem with my 4x4 shifting from 2hi to 4hi all by itself while driving. Sometimes just the light would flash and sometimes it would actually shift into 4 hi. I ended up replaceing the tccm box under the dash. The problem was solved . FOr about a year. Now it is doing it again. I found the first one on ebay.I think i got lucky because i havn't seen one on there again. Just wondered if anyone had a place where i could get one. Thanks.....

Check your local salvage/bone yard.
But
You need to check it out first.
Coud be other things to.
What transfer case?
Any codes?