How would I go about preserving a dissected frog?

I saved a frog I dissected in a biology class, and I want to be able to preserve it in a jar. How would I do this? It’s already been injected with latex and the like, so it shouldn’t rot or anything, but I want to be able to kind of showcase it. I’ve heard about storing the frog in a jar of Formalin, but can that be bought over the counter anywhere? Thanks.
Or could I use alcohol to preserve it? That would be so much easier.

Pickle it? That would be insanely cool. A pickled dissected frog on your bedside table. (Just kidding.)

Anyway, yes, you can buy formalin over-the-counter. I think, at least.