So, at this point, just about everyone knows about the Chancellor/Stash combo, right? Well, make way for Scavenger/Stash! with just 3 Stashes and 2 Scavengers, you are guaranteed a Province every turn (assuming no hand-reducing attacks available): Just use your Scavenger to make your other Scavenger the only card in your deck, then play your Stashes, buy a Province, shuffle (putting your Stashes on top), and repeat.
The big problem with the Chancellor/Stash strategy was that you couldn't guarantee that you would get a Chancellor with your Stashes, meaning you would almost definitely NOT be able to get a Province every turn. As a result of this, it's also necessary to get 4 Stashes, just in case you end up with only 6 or 7 money after the reshuffle. Not only that, but with Chancellor, it's necessary to get a bunch of Chancellors in order to increase your chances of drawing one when you need it. However, with Scavenger, 2 and 3 Stashes is all you'll ever need.
This combo is also pretty easy to set up. Open Silver/Scavenger (or Stash/whatever), then buy Stashes when you have $5+ (or Scavengers, if you already have 3 Stashes), a Scavenger next time you have $4 (or next two times, if you din't open with one), and Silvers with $3 (or $4, if you have 2 Scavengers already). Then, once you have three Stashes and two Scavengers, use your Scavenger to make your deck a Scavenger, and begin! I imagine a player could have everything he needs by turn 7 or so, and just start cashing in.
Someone probably has already realized this, but I didn't see a post on it, so I made one myself.
