I have the Instyler curling thing on the left in the picture. I quite like it. It works reasonably well and isn't that heavy - although, for me, even holding a feather up to my head would be tricky after a couple of minutes!! I don't use it very often but mainly because I never go anywhere and it's too much strain to do it just for the heck of it!!
I think I paid something like £17.99 for mine (also a TSV) so £30 for the 2 seems about right.
I was wondering the same thing as Frazz and whether it was old stock that they are trying to shift. I think the original QVC price of £115 is somewhat misleading as it can be bought cheaper elsewhere. I suppose those customers who want to develop their biceps will think they've got a good deal.