i just ordered the book "The FE2b Flies again," and my Weta dollars from previous purchases covered the shipping cost.
make sure if you order from Weta they have what you want at the warehouse on your continent. (or closest, i live in Thailand and so only order from their NZ warehouse). shipping from the wrong warehouse will erase your savings.
WNW themselves offer more reasonable shipping rates.
I think Weta are getting out of the WNW business, their inventory is dwindling and they don't get new releases. that said, even if they discount their kits more steeply in the future, the postage from the wrong warehouse may still destroy the discount.