If Amazon sells out, it's worth noting that the Lego Store restocked Optimus Prime, too, but you'll have to pay the full $180 MSRP. Lego officially denotes Optimus Prime as "hard to find." ...

Speaking of Lego sets that have been sold out for months, the awesome Transformers Optimus Prime is back in stock at Amazon. Better yet, Lego Optimus Prime is on sale for $144 (was $180).