|Most of their wines are under $20|
Bargain Wines from Sonoma by Wine Enthusiast
I've certainly not tried all of them, but have had several. I've had different wines from others on the list and know their quality so I believe this is a pretty good group. I'll add that if you're looking for Sauvignon Blanc or rosé you can find quite a few more bargains of excellent quality. Often you can find red blends, Merlot, plus the occasional Cabernet or Zinfandel for under $20, too.