How much would it cost to ship them to the states? I'm guessing it's probably the size that's killing you on shipping, since they're so light...
Anyway, you could ship it to the UPS store in Ogdensburg, NY and drive about an hour each way, which might be worth it if you buy a tank of gas down there too. Customs will usually just send you through without charging you if the value of what you've bought isn't very much. See
http://www.theupsstore.com/locations/locdet.asp?strCenterNum=MBE2946 for the address you would have to have it sent to.
OR... I am driving down to visit my family in Wisconsin in a couple of weeks, and if you could wait until early September for the trays, you could have them sent there and I could bring them back. With everything else we'll be bringing back in the back of the station wagon, a couple of trays is nothing! Send me a private message if you're interested.