So if I send you the funds now, couldn't you put them in an envelope and mail them when you get to the US for TDIfest.?
Here's an approach:
Make a quick stop at a US post office upon your arrival to assess weight and therefore cost of shipping. Make up a package with a single, a double and if needed a triple set of frames.
Hand them to the clerk at the US Post Office..He weighs them and tells you the price and now you know the cost for each.
If you KNOW how many you need of each, you can ask the postal worker to print you exact postage "stamps" (actually they are labels) so you don't have to mess with odd numbers of stamps. (Plan B is to just buy the stamps you need ie, 37 cents is one US stamp..if the total is an odd number ie $1.15, you need to buy some 4 cent stamps (3- 37 cents + 1- 4 cent = $1.15.)..
Anyway, you figure out the combinations you need, buy the stamps and again, affix them at your leisure and then drop them in any mailbox (Just make sure it's not an EXPRESS MAIL mail box)..
that's it...
Let me know if that works for you and I will be happy to send you the funds for 2.
Thank you
Ed in Metuchen, NJ