I'd also try another US site http://www.spruebrothers.com/
Lately they've been pretty good at adjusting their mailing rates after initial payment. This is because their site, like so many out there, are automated for initial billing. While packing your order, if they can place smaller items into say the model kit box you had bought, they will send you a refund.
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Distance wise from Asian web stores, you are a bit closer than I am here in north eastern Ontario. So a couple out there I suggest is http://www.luckymodel.com/ and http://www.hobbyeasy.com/
These both offer the option of declaring low value on your parcel, thus avoiding duty costs. Most importantly, order only those items that are definitetly in stock. Many in the past have ignored this and then have wondered why it is taking so long for their order to ship.
regards,
Jack