The last order was 1 tube for $7.29 + $1.99 shipping (so $9.28)

I realized I was mistaken I ordered from amazon.com not amazon.co.uk and it shipped from the UK.

It does look like it's gone up about a buck or so since then, but here's the URL: http://www.amazon.com/gp/product/B008VPSTOA

Also one of the places I bought from via Amazon sells direct as well: http://www.britishpharmacare.com/index.php/sensodyne-repair-protect-whitening-toothpaste-75ml.html

If you can make a trade with UK or Canada you can probably save some $ (and make a fellow snackexchanger happy) but if you can't arrange it, I've found these to be good sources.