Can't beat heron, but here's my answer: Your deck is Gold, Gold, Gold, Silver, Silver, Trader, Native Village. Trader and at least $8 worth of treasure is your hand. Overpay Stonemason for 6, gaining two Border Villages, gaining two Death Carts and 4 differently named Ruins. Trade one of the Ruins for a Silver. This makes your 8 Vineyards (they're on the Native Village mat) worth 3VP more each and your 7 Gardens (also on the NV mat) worth 1VP more each and your 8 Fairgrounds (also on the NV mat) worth 4VP more each and your 7 Feodums (on the mat) worth 1VP more each. That's 70 points. You have only 0 points in the beginning because Gardens and Fairgrounds don't count cards on your NV mat, they only count cards in your deck.
EDIT: My first answer would've been impossible due to 3-piling, but luckily fixing it only costs one point.
EDIT 2: No wait, I can do better than that! Though now the fix to the 3-piling problem costs 2 points ;__;
I also thought of abusing Horse Trader's reaction to start the turn with a 5-card hand and play the turn with a 6-card hand, but can't find a way to make it any useful.