Update for everyone: I've sent out the first batch of adapters today and have got a better handle on the shipping costs:
International (Air) is still flat $11.00
US Standard Mail is now flat $8.00
Canada Standard is now flat $4.00

Those cover all handling/processing fees. All methods should be on average about 4-7 days shipping time (so the post office tells me). Anyone who's placed an order already will be credited appropriately when your order gets processed and shipped (those of you who got in on the initial batch will have gotten the confirmation emails noting this today already). As I stated before the next shipment of adapters should be getting to me within the next day or so, so for anyone who's ordered already you should be looking for a ship date within the next 2-3 days.

I want to point out that anyone who is ordering now should bare in mind that again there's going to be a few days of lead time before I can ship as I've got to wait on supplies (and mod'ing the adapters and thoroughly testing them takes a bit of time ontop of that!); the demand for this item has been quite staggering and I've had to keep adjusting my stock estimates accordingly.

Thanks!

-Rob