I saw it selling for $20 too. It wasn't even out for a month, yet. I think it was around Thanksgiving. This game was on my must have list but I buy so many games (seriously, there is something wrong with me.) that I told myself that I didn't need to buy it.
I buy three types of games: Blockbuster games, games that have a low profile but I know are quality (the gut is NEVER wrong), or games that feature a hot female. A Boy and His Blob is one of those games that I KNOW is a great game. I'm buying it very soon. You should too. Never doubt the gut.