GSG-5s are SUPPOSED to cost around $500, and did before the Obama-panic; hopefully they'll come back down soon.
The best price on a working, shootable Garand out there is with the CMP. They sell service-grades for $600. You have to jump through a couple hoops to acquire them though (most notably, you have to join a CMP-authorized organization - the cheapest and easiest of which is the Garand Collector's Association. Membership cost is $25), shipping costs $22 or so and they're delivered to your door (not a dealer) so you're looking at $650 in practical terms for a Garand. I've never seen anything cheaper that wasn't a junk/parts gun.