I've not seen or heard of any for the LT5 that specifically claim to be reusable. But, as Dom said, Jerry''s top end gaskets, can be coaxed to give good service if re-used once or twice, I find; plenum, TB, IHs, in particular.
I find by spraying one side of those gaskets with silicon spray as a future release agent, that I can sometimes reuse them a couple times (but reuse more than that, they start getting brittle).
I have heard of some that have cut plenum gaskets from a sheet of rubber. And, of course there have been rubber valve cover gaskets for pushrod motors since I was young...let's just say a loooooong time ago!
Head gaskets...NEVER (or at least I never would...especially on a motor that has to come out and has to have the cams re-timed.)
I'll bet Marc or Pete or Jerry or Bob G or Greg, or Scott or Ron H might have some thoughts too?
P.
P.