I bought a helios 44-2 2/58 for $10 to tinker with.
The glass is perfect as far as I can tell, but one of the blades is torn so it cant be repaired. It works OK especially if you leave it wide open, but sometimes they jam, or there are two points apertures.
The metal is OK, but some of the screws are missing.
Really, if you need to replace your glass and if that is even worth doing, I would be happy to mail lens to you in the condition it is in for the cost of shipping.