I ordered mine from BBTS (to Canada, shipping was $60.00 and duty another $35.00). I just checked their stock and they have 125 available (if you don't know already, just add IM to your cart and update your cart to 1000 Iron Mongers and it'll advise how many are actually available), so I'd monitor the site until you're no longer comfortable with what's available and then order.
Also, personally, I'd put this purchase ahead of anything that's upcoming from IM3. Considering they haven't announced anything, you're going to have lots of time before the pre-order comes up - let alone actually having to pay out. To be honest, I felt a little sick ordering this fig considering the price, but in hand, it's worth it and justifies the outlay. If I were a little wealthier, I'd get a second one just to keep MIB. It's really that good, so pick it up if you're able and worry about IM3 stuff later!