Here are a few that should be readily available just about anywhere, and represent very good values in the $12-$20 range:
Arrowood ‘Grand Archer’ Sonoma Cabernet Sauvignon – Worthy little brother to the always-worthy Arrowood first label.
Chateau St. Jean California Cabernet Sauvignon - This "California" Cab gives a few "Sonoma" Cabs a run for their money. (and that's like your Aunt Jean, not Jean-Claude).
Chateau Ste. Michelle Cabernet Sauvignon - Premium division of the folks who bring you Columbia Crest brings you a bit more refined Washington State red.
Chateau Souverain Alexander Valley Cabernet Sauvignon - A tad more tannic and oakey, typically, than others in this range, making it possibly more age-worthy.
Rodney Strong Sonoma Cabernet Sauvignon - Rodney Strong wines don't get the credit they deserve. Do Rodney a favor and buy a bottle. Try the Merlot, too.
Sebastiani Sonoma Cabernet Sauvignon - Luscious cherry fruit Sebastiani is noted for.
Simi Alexander Valley Cabernet Sauvignon – A major contender in this category and price range.
William Hill Napa Cabernet Sauvignon - One of my perennial favorites. Often overlooked, it can compete with $20-30 Cabs easily.