I paid $560 for the last hk SBE I bought off gunbroker. The one before that was in almost new condition and included a sure cycle return spring, and I only paid $800 for it. The last M1 I bought cost me $550. I bought a NIB camo M2 with comfortec stock for $1075 and paid $1150 for a very gently used camo SBEII with comfortec stock. I'd say you could find one for under $700, if you're willing to look around.
Smell that? Smells like sumthin died in here.