Astor Wines & Spirits takes 20% off all American wines as part of its All-American Sale. First-time customers get free shipping with orders over $99. (New York City customers may qualify for even lower minimums.) After discounts, many wines are priced less than competing online stores like Wine.com, BevMo, and Binny's.

A best bet is Dominus' Freemark Abbey Cabernet Sauvignon 2010 for $27.99 per 750ml bottle. That's $9 less than what Wine.com charges for this 90+ point wine.