ASICs were for sale from Avalon http://launch.avalon-asics.com/ but they only took orders for a <1000 in 3 batches that sold out very quickly and are going for 20k + on eBay. Butterfly labs has been promising a lot for a long time but there is no evidence yet that they will actually deliver anything. They have taken a lot of pre-orders though. There is a third company that lets you buy shares and is running ASICs but doesn't sell them. I can't remember the name at the moment.