Same problem as you bigsarg7, I've had a few items turn up a bit late after bring sent by 'airmail'. Usually what happens is that the buyer pays for airmail, but doesn't put the sticker on it, or USPS are just not up to the job, and don't look properly and send the item by surface.
Usually most items turn up within 3 weeks by regular mail. For a bit more urgency, I usually get the stuff sent by Global Priority which can take 1-2 weeks.
Hang in there andrew3134, hopefully it will arrive. Again, keep in contact with the seller, ask them questions all the time....how was it sent, what date was it sent, is there a tracking number. Then if by 35-40 days it hasn't arrived, put in a claim with Paypal. If they haven't sent the item...trying to rip you off.....they usually will send the item then, or else you should get yopur cash back.
Best of luck with the box busting when it arrives.
Ersk