drop a note to the ebay seller, tell him if their touchpad already comes with the protective brown carton box, then no need to use another bigger box for shipping, at most slip it into an envelope, or juz paste the shipping label direct onto the carton box and ship.
the above will def help u bring down the shipping charges when it reaches borderlinx, irregardless, if they dun ship in an oversize box, your borderlinx fee wont be more than 30usd from personal experience, dun worry
also, dun worry abt comex too, even if (most prob) the price is lower (wont be lower than 188sgd for 32GB standalone anyhow), there will be long queues, mad rushes and human traffic jams, just take it that u pay a slight premium to get it faster and avoid all the troubles
now that dusts have settled on your side, just sit back, relax and enjoy your touchpad when it arrives in spore