After some confusion about Smokey, here is what Mitch from postersandtoys said in the comments to explain the situation…
Yeah, you're right. This all didn't quite work out how I envisioned it. I should have used a different item number. Since the price change wasn't visible to people, it did seem like kind of a sour deal, so I will be refunding the people that paid $300 their extra $100. Sorry about that, and hopefully my mistake doesn't reflect badly on Ken, I just honestly didn't forsee the in-cart price switch, and how it would work. I thought people would see the price change to $300, then make a decision. My apologies guys, sorry.