I bought two v2 blade at the end of October for 250 each, fast forward to the third week of November, I ended up paying 425 each for two more v2 blades. When I tried to get the seller down, he / she claimed that the price is tied to btc. I bought them, but also stated "You are getting one hell of a profit since you bought these for a fraction of what you are selling them for"
Sad part is I can get a 100 GH/s X-1 for less than the blades now.
In march... don't miss this from the bottom of the description "
This is a PRE-ORDER, available for dispatch at end of February 2014" use an online calculator... difficulty increases have been averaging near 25-30% and it's going to be shooting up when the new machines start firing up. Order now and there'll be a lot of folks getting online before you.
Nothing out there is not worth much if you get it in march unless difficulty stalls out or price goes back to it's 10x/month rate of increase (both of which are unlikely imho). If you start on march one, and ignore electricity and shipping, then 100Gh in marge will get you around $350 in ~70 days, and less than $100 for all time to come after that.
Also don't miss the "minimum order 10 units" at the top...