As Dave said, the problem is in the addressing and packaging and shipping.
Pozible have told me that after the campaign I can download all the names and addresses in .CSV format. If so then it is easy to load into my label printer and print them off.
Then it's just sticking labels, stuffing envelopes, and a stamp. The rulers would have to be just tossed lose in the envelops to save time.
I can get pre-paid $2.60 stamps for international postage in bulk.
This all sounds quite doable.
BTW, the boards might be US$0.73 but cost about AU$1 ea when you include courier and the now shitty aussie exchange rate.
How does AU$10 inc postage for two boards sound? That would make it worth my while I think.