I've heard speculation (as in not officially or verified in any way) that the price on the minis will be going up to $12.99 (let me say that this is just speculation again). *if* that were true then the price on the huge mini would be $7.
Random or not, that is a great price for a mini of that size. Heck, I pay $7 or $8 for medium minis from Confrontation or Celtos. Sure you can argue that they are random and thefore not worth the risk... but if you are playing any collectible game you need to seriously consider trading to get exactly what you want.
And I don't want to hear how WotC is so greedy and so horrible for raising prices. They are a company, not a non-profit. They provide product with the intention of making a lot of money. That is the whole point. And raising prices would not be a betrayal. Lower introductory prices during the first year or two of a product are a valid, and frequently practiced, business tactic.