In terms of long arm milsurps: Mosin-Nagant (91/30s and M44s), Yugo M24/47 and M48 (Mauser actions), Steyr M95, M1916 Spanish Mausers,
For a bit more (up to about $350) you can throw in a few SKS rifles, Russian-capture K98k, perhaps a Finnish Mosin-Nagant, K31s, Swedish M38 Mausers, etc.
In terms of milsurp pistols you're looking at Nagant revolvers, most Tokarev variants, CZ-82s, you might be able to find a Makarov as well.
If you're interested in milsurps, I highly recommend you get a C&R. It'll easily pay for itself after 1-2 firearms. This is by no means a complete list, there's lots of others available but sometimes it's just finding the right deal or even what's available on the market at the moment. Condition also can have a big affect on price...ie condition of the bore, matching part numbers, etc.