If you haven't experienced Mutant Crawl Classics yet, think First Edition Gamma World, turned up to 11 (insert Spinal Tap reference here). If you like the Dungeon Crawl Classics RPG, you'll likely love the MCC RPG. If you aren't a fan of the DCC RPG, MCC may be more hit or miss for you. But hey, that's what these bundles are for.
The threshold price is just about 21 bucks, which also gets you the supplement The Data Orb of Metakind (published as MCC adventure #8) and six complete adventures for character levels 0-5: #10: Seeking the Post-Humans (a level-0 "funnel" campaign starter), #2: A Fallen Star For All (for level-1 characters), #3: Incursion of the Ultradimension (level 2), #9: The Evil of the Ancients (level 3), #5: Blessings of the Vile Brotherhood (level 4), and #6: The Apocalypse Ark (level 5). That's pretty much a campaign worth of gaming right there.