Just across the valley you will see the Castle of Altesino, the centre of a vineyard that you can visit and that sells direct. You reach it off the Buonconvento to Montalcino road.
Perhaps the largest vineyard is Banfi at Castello di Poggio alle Mura well the other side of Montalcino. It is the one that lacocca former Ford Vice President, poured millions into years ago and it has restaurants, an olive oil press, a castle and large wine cellars to visit. There are over a hundred vineyards so you could do a lot of tasting!