Dunham's has some great deals when they have their sales. I've seen them as low as $79.99. Normally they have 8-15 in stock. They a little more for laminated stocks or hex receivers when they have them.
Another vote for Bradis, they usually have 30 or so. If you have a smartphone make sure you check 7.62x54r.net while you are looking to answer any question you may have. I ended up getting an early 20's Tula hex receiver 91/30 that is awesome. Best of luck and you won't regret it.
I just picked up my first Mosin 9130 week before last from Bradis. They had probably 50 in stock to look through. I found four or five with hex receivers. I chose a 1931, all numbers matching, with a near perfect chamber and rifling. Came with all the accessories. You might be able to get them cheaper elsewhere, but I liked being able to look through a large selection of them to choose a good one. Be careful, there were 3 or 4 there that had the end of the muzzle counterbored at some point. (Probably done at the armory as a fix to a damaged or worn muzzle.)
My plan is to build something with it similar to the sporterized 9130 that Iraqveteran8888 did on youtube.