Take extra money and buy two
They are a fun rifle and have a long history. They are still in use today in places like Afghanistan and Pakistan.
There has been some discussion about the level of quality of 91/30's tat Big-5 has but if the store has a good manager, he/she will bring out a number of them for you to inspect. Take along a bore light or get a Mag-Lite "Solitare" flashlight to check the bore. Lots of good information on Mosin's here:
http://7.62x54r.net/
When I bought my 91/30 at the local Big 5, I got a 1931 Izhevsk hex-receiver rifle that was in very good shape. I also got a bayonet, ammo pouch, take-down tools and a lube container. Don't know if these still come with the rifle or not but thery are available thru internet sources.
The 91/30 doesn't really need to have the bayonet mounted to shoot well (the M44 will shoot tighter groups if you extend the permanently-mounted bayonet). Like any milsurp, if the rifling is good and the crown is in good shape, a 91/30 should shoot 3-4" groups at 100 yds and 6-8" groups at 200 yards, That was the Soviet standard for their infantrymen. My 91/30 will shoot like that with just about any of the available milsurp ammo currently available.
I also sometimes wonder where my rifle has been. The cold and snow in Stalingrad? In Moscow waiting to fend off the Nazi hordes? Teaching hundreds of Russian peasants how to shoot to defend the Motherland?