Yeah, they can be cheap but they can also be a disaster- quite a few used DH bikes have been run into the ground.
That Scalp got my attention there.
Or an ever popular option is a 224/224 evo- I loved mine, I can’t say it was a great bike tbh but it was great fun to ride, and it had absolutely no learning curve- I could do a day on my hardtail then jump on the evo and just go. My Herb was way faster, like 20 seconds a run at fort william, but it always took me time to relearn it every time I rode it so say 8 runs at innerleithen, the first 2 I’d be riding like a dobber. And tbh it just wasn’t as much fun. The geometry on the 224 evo is still pretty decent because of all the adjustability, everyone just instantly smashes it all to the long/low setting which makes it IIRC about 63 degrees- it’s shorter than a modern bike would be though. People go on about “bombproofness”, it’s absolute pish, they’re a little bit delicate- so if you do go this way, do check for cracks or repairs. Though, don’t even necessarily be put off, there most be a hundred 224s out there with random repair welds still doing hte business.
And, they are cheap and the evo can use 135mm wheels and 73mm BBs.