Key point is the old fork's axle to crown distance. The only cheap forks (less than $50) I can find are ~400mm axle to crown, I don't think that is the proper suspension corrected length.

There are 26" rigid forks with 1" threaded steerer:
http://www.universalcycles.com/shopp...1&category=703

Here's a Tange with 1" threadless steerer, you'd need a new headset too:
http://www.universalcycles.com/shopp...8&category=703