A GoHastings rep has stated before on these forums that their pricing algorithms don't factor in their current coupon codes or sales.
You might have seen prices shoot up, but over the 20% off, the 55 cent shipping, and now the 96 cent shipping, I've grabbed a handful of games that have just dropped to all time lows on my price monitoring.
Perhaps there's supply and demand built into the pricing algorithm and say they had two Test Drives last night, but someone bought one today at the low price because of the low shipping, so now the last remaining copy goes up because supply is low. Just a thought.