If I got you correctly, that's $300 per unit? After looking at a lot of new lowish-end units & combined lower-end unit prices, I figured the price is set around $300-$400 for 10Gh's, so that would be a good deal I think
I've noticed a rash of price cuts for older ASIC mining machines. I think it's because of increased difficulty and anticipation of next gen rigs. Most of the next gen rigs are not in heavy volume delivery so there is small window (2-3 months) to mine with current gen machines.