I would pass on these blanks or any of these random deals. This is their way of clearing inventory. Or if you really want to just do one order. Make sure you do not order from this deal and the other on shirt.woot on the same order. I've done that in the past and the screw up the order each time, by sending only half the purchase.
Not only will they screw up the t-shirt count, but when they "fix" it, expect the whole package to have the same color shirt. To give you an example, the last "random" order, the fix my shorted order by sending 5 "Watch it grow", 3 "georgetown waitlist", 2 "yale waitlist" and "2 notre dame waitlist". It wouldn't have been so bad if there was one or two dups, but it seems like they just grab whatever stack of shirts is there to fill the order. So you may get all green shirts.