Looks like new Avalon Batch is coming after New year:

http://avalon-asics.com/product/avalon2-new-2u-size-machine-300ghs-with-a3255/

Unfortunatelly price doesn't seem so cool.

5BTC for 300GH/s Avalon is 0.0167 BTC/GH
vs
1.45 BTC for 180GH/s Antminer = 0.0081 BTC/GH

which is more than twice the price for Avalon, that also has highest power consumption and probably highest HW errors rate