Finders Keepers

Written by Janek Sielicki, Finders Keepers is an epic adventure for 20th level PCs. Featuring custom art and maps, as well as a bonus "making of" article, it sold almost 100 copies in a month.

From the listing:

How many times have you started a campaign and it dissolved before you reached the top tier? How many builds have you made, all of them assuming reaching level 20, but you have never managed to try them out? Put your regular campaign on hold and see what happens when PCs reach level 20!

“Finders Keepers” is an epic Dungeons and Dragons adventure, set in Forgotten Realms and beyond. The stakes are high: the location of one of the legendary Books of Keeping has been discovered, and now various powers of the universe vie for control over that power… Devils, demons and fallen angels; the mighty shall fall and who is going to be left smelling the ashes?

The adventure starts with a fight with an ancient red dragon. Then things escalate and your players will have their 20th level spells, powers, and skills tested! Battle the game's most powerful beings, visit distant planes and make world-shaping decisions! The fate of Toril is in their hands…

With this purchase you will get: * (These are just stats, to spare you the headache of making builds etc.! I'm sure your players will love to create backgrounds for them, make up the heroic deeds their PCs performed on their way to level 20, after all: that's what roleplaying is about!)
 * 15-25 hours of gameplay
 * Custom made art
 * Map of Phlan by Elven Tower
 * 3 custom made maps, each provided in grid/no-grid, for players/for DM versions
 * Set of 11 pre-generated 20th level Player Characters*
 * A 10-page article about the process of making "Finders Keepers"

Accolades and Reviews:

Best of Dungeon Master's Guild (July)

Review on Mephit James' Blog

Sean's Pick of the Day

EnWorld

On the Guild

This product can be purchased here ($3.95): Finders Keepers.