Prehistoric pets sells them from time to time as well... but I dont like their prices. And petsmart gets them from time to time. At petsmart they are $99.99
midnight blizzards have actually never been a proven genetic, as it stands right now it is nothing but a darker blizzard, not even proven to be line bred, if you do a search you can find a few threads on them.
I do agree with Trizzypballr statements. However if you do want a "midnight" blizzard you need to go here: http://www.crestedgecko.com/crestedgecko.htm. They don't have any right now but they are the only place that I know that has them listed. I think you would be looking into the $100-250 range, if I recall their prices from last year correctly.
midnights are a crapshoot... I bought one awhile back that was sold as a midnight and line bred from some very dark blizzards. (or at least sold that way) - now that he's an adult he's more like a banana. I have a normal blizzard that is twice as dark as him..
I would stick with Blazzings also..
I agree dependent on the breeder the price can very.. Personally I wouldn't pay anything over 50-60 for a blizzard or midnight.. Blazings a bit more but it depends on whom I'm getting them from how much i'm willing to spend.. if they are from a pro and I trust them whole heartedly; i'd be willing to pay more.. you get what you pay for honestly..