EDIT: Duh, I spelled "rigid" wrong.

I'm converting an older Raleigh M50 Mountain/Trail for city use. I'm trying to use as much as I can off this bike, but the front fork flat out sucks, no matter how I try to get on with it. The gaskets are degrading, it's slowly leaking oil, and it bottoms out way too readily, even under fairly restrained braking. It's almost to the point where I feel it'd be a safety hazard. SR Suntour M7700, for those curious.

In any case, the bike uses linear pull brakes, which will be perfectly serviceable with some new pads, noodles, etc. I'm wondering if I can grab a rigid fork to replace the Suntour, one that has the appropriate studs for these brakes, fits the bike, 26" wheel/rim, etc. I'm trying to keep it at around $50 or under, if at all possible. Any thoughts?