Carol, if you're in a country that imposes VAT on ebooks or electronic downloads, it seems that buying is barred for that reason. Permies would be breaking the law not to collect and send VAT to the government of the buyer's country. Completely sucky, I know!
Are you in the UK? If so, you can tick the "No VAT" box. Ebooks no longer attract VAT in the uk.
I'm only 60! That's not to old to learn to be a permie, right?
Justin Rhodes 45 minute video tour of wheaton labs basecamp