That Sensodyne paste struck some memories; I recall having seen it at a local shop, possibly even trying it, although at a much lower price, and a quick check on a local price list site confirms it.

https://translate.google.com/translate?sl=auto&tl=en&u=https...

All prices under €4, but of course shipping rates are for local delivery and I have no idea if the sellers can ship abroad, most of them might not even speak a word of English, however here they are; making quite a big order would defeat the costs for shipping to the US, which usually are high.