I did contact the company in regards to ordering a quantity of the tensioners and to see if they may ship them to me in the US. I'm not holding my breath but maybe if we order enough they will ship them.
The glow in the dark 50pk runs £19.95, or about $40 US. Buy the time you figure in shipping and other charges that may occur, you are probably looking in the neighborhood of $1-1.25 each.
Who would be interested in picking some up if I could get them?