KJ is a good one. If you can get it on sale Clos du Bois is a great one, its my favorite chard. Its like $12-14 normally, but its REALLY good and worth the few extra bucks.
Barefoot makes some good inexpensive wines that have won awards, as their Chardonnay has. Try one. You will like it.They also offer a Pinot Grigio - Chardonnay blend..