Yes, it occurs quite a bit.
If you can scan them in with a scanner (but don't assemble them, this was a problem with the last project and it took several tries to point out the blunder that was occurring) you might be able to find someone who can touch it up and possibly convert it to vectors. At that point you would have a workable file that you can send off to a printer to have a new one printed up. However, I don't know of anyone that prints directly to glass or acrylic. It's usually a sheet that's sandwiched between two pieces of acrylic. The trade off is you can control the costs however you choose but you'll invest more time and effort in the overall process.
For the time and effort that would be spent, you can easily exceed four working weeks. Take a look at some of the other threads to see how long they've gone on. $470 might not look like a bad deal for some people.
If you do send them off to the restoration company, I would insist on getting the originals back. You wouldn't know what kind of quality their work and you'll want to compare the two once everything is said and done. That's just me though.
Some people in the community here would love to archive the resulting image (and possibly the original raw files) as part of the trade off. That could be their incentive for the touch up and/or conversion work.