There are three bundles and altogether I think covers all HERO 5E books available except for a couple of licensed books they can no longer sell. Well worth it and I'll be buying all three.

HERO System 5E Megabundle ($43)

35 products including HERO System 5E Revised core book and a lot of the non-Champions sourcebooks.

Champions 5E Megabundle ($42)

24 products though less appealing since I already have a bunch of these from a couple of previous bundles. It's $111 of PDF products I don't have so still worth it.

Champions 5E Universe Megabundle ($41)

20 products which are less core than in the base bundle. Once again a great deal even though I have a few of these books already.