You can buy them direct off LORD as well who are the original supplier to Bell for around USD 3600.00.
I am out of touch with the latest information but in days past you could claim for the unused calendar life under "warranty" if purchased from Bell of course.
As part of "product improvement" and increased calendar life this may have disappeared like the Dodo as well!!
Interesting part is that this TT strap design is widely used on earlier generation aircraft and even though the design and construction looks very similar, finite and calendar lives vary considerably.