I live in Washington's wine country. There are lots of good bottles sub-$20, especially if you join a wine club and find case discounts. Here, there are plenty of > $50 bottles, often priced that way as positioning to the buyers they want to attract far more than as an actual measure of quality. For small time producers, there's a very real need for a premium price because when you are only bottling 5000-10,000 bottles, you gotta at least break even on them.

Here in Spain there are lots of fantastic wines around 5€, although I assume you're surgically taking about the states.

Perrin's CdR is ~$10 I believe—we used to drink that almost every day when we lived in NY. Also Jelu from Argentina is a fantastic Pinot Noir for ~$10 as well I believe.

Be careful with your price ranges there, the most expensive wines in the world are Pinot Noirs!