Single Weider Hex Dumbbells: 15lb/$7, 20lb/$9.37, 25lb/$11.58, 30lb/$13.38, 35lb/$16.30, 40lb/$18.84, 45lb/$21.18 @ Sears.com
Sears.com has some good deals on single Weider hex dumbbells. Even cheaper if you still have the $10 Fitness points (or others). Pick up may be available depending on location. Shipping is free over $25.