Or they just aren't going to reveal him until after the movie opens. I mean, they haven't shown him in any of the TV spots, just the theatrical trailer.
Hot Toys are way too expensive, but I buy my son a lot of the Marvel Legends figures. They're typically pretty awesome looking. And if you look at the latest series (and the Lego sets that are already available), there's a spoiler for the appearance of Giant Man in Captain America: Civil War. The thing I hate about those series though is that they always have like four cool characters, then two or three lame ones (or unrelated ones), so if you want to build the BAF character, you have to buy the parts on eBay, or buy the characters that you don't want.