A lot depends on your scope of collecting. By your interests in a M1 Garand and M1 Carbine I would surmise that your are interested in WWII firearms. If that is the case then there are still a few very good buys out there for military collectables, just not near as many as 15-20 years ago. I would focus on what is still available in quantity right now before they start getting scarce. The Swiss rifles can still be had for around $500 and are probably the best buy right now for what you get in condition for price, it will not be so in the coming years as they dry up. They have really nice triggers, and with good ammo are very accurate. Mosins can still be found for $300 or so, with Finnish Mosins demanding $600-700. Italian Carcano's can be found for very cheap $200, they are however most in pretty poor shape when buying from a C&R dealer that's uncrating them. One can find French MAS's for $800-1000, and they are in very good condition and is a very nice cartridge to shoot. Lee-Enfields are still pretty plentiful, but the condition varies widely due to the extreme use they had in the war. I kind of categorized current pricing in my mind, I'm probably off on some but should give you a starting point on WWII long arms. I'm not as knowledgeable on handguns of WWII, there are also shotguns that were used as well.
For me I would look at
Atlantic Firearms for the Swiss rifles, they have the 1896/11 and 1911 on sale right now for $480. Looks like they have some well used Steyr M95's for $200.
[$*] Swiss 1896/11
[$*] Swiss 1911
[$$] Swiss K11 (carbine version of the 1911)
[$] Steyr M95 Mannlicher (early war use, phased out pretty quickly)
[$$$] German K98
[$$*] German Gewehr 98 (early war use, phased out)
[$$*] Swedish Mauser M96
[$$] French MAS-49
[$$] Lee-Enfield SMLE
[$*] Mosin Nagant M1891/1930
[$$] Mosin Nagant M1944 Carbine
[$$*] Finnish Mosin Nagant
[$$$$] Swedish Ljungman
[$$-$$$] Japanese Arisaka (6.5mm, 7.7mm) (extra $ for intact chrysanthemum)
[$$$] American M1903A3
[$$*] M1 Garand
[$$$] M1 Carbine
[$] Italian Carcano (6.5mm, 7.35mm)