I definitely feel your pain. I've got a TRG-S (M995) in .338 Lapua that I am wanting to re-barrel with a 1-10 polygonal heavy barrel. I can get the barrel installed for under $400. The stock is going to cost me close to $900. That just seems wrong. Here is what I have found:
Option 1 - I can get a McMillan stock for right about $500. Then I have to buy bottom metal which I think I can get from McMillan also for about $175. So I'm almost $700 into a stock. I was looking at their A3 stock. Since I am already spending so much money, I honestly don't think it makes much sense not to go ahead and pay the extra $160 to get the stock with the adjustable cheek rest. So now the price tag is around $850, just for the stock and bottom metal.
Option 2 - This option has just recently come to my attention. KRG is making a really nice looking stock that they are working right now on cutting a model to fit the TRG-S. They call it the Whiskey-3 Welcome to KRG
The price is right at $850 but would not need to replace the bottom metal as it comes with its own and it looks to be nicer, and it also has an adjustable cheek rest. So it is about the same exact price as the McMillan, but it has a rather nice advantage: it takes AICS magazines. This could be a disadvantage if you prefer the flush mount factory mags that come with the TRG-S, but I like the extra magazine capacity of the AICS mags. My factory TRG-S .338 Lapua mags hold 3, the AICS hold 5. Another benefit to the AICS mags is that they have recently started making a version that are longer to allow for a longer COL. This is indeed an advantage for .338 Lapua. But the biggest advantage I see in the AICS mags is the mag release. I've always been disappointed in the factory TRG-S mag release. It seems a bit skimpy and it is difficult to operate, especially with gloves and its almost impossible with mittens. The AICS mags have a rear mounted paddle style mag release. That is very nice. They generally run about $80 so they are about the same price as a factory TRG-S mgazine.
So, my research to find a less expensive option for a stock for a TRG-S actually yielded a more expensive option, but one that I am very intrigued by. I think I am going to go that route, but it will take some time to come up with the funds for this project. I've talked to a guy (via email) at KRG and it sounds like the Whiskey-3 will not be available for the TRG-S until late summer anyway.
I never intended to "trick out" my TRG-S to be a full bore sniper rifle. I always liked the light weight tapered barrel for hunting. It is only my desire to shoot heavier bullets up to 300 grains that put me on this path. I need 1-10 rifling to shoot the heavier bullets. If I'm going to pay for a new barrel, it does not make sense to not put a heavier barrel on a .338 Lapua. The heavier barrel requires a new stock. It does not make sense to not get the adjustable cheek rest if I'm going to spend that kind of money on a new stock. If I'm going to spend that kind of money on a new stock, I should get the one that uses the better magazine...so that's where I'm at now.
Sorry for rambling on. I hope you find some use in something I have said here.