If you are looking for a great space saver for your home gym, you might consider these adjustable ‘click’ weights instead of purchasing a full set of dumbbells. Pictured is a pair of 12.5lb dumbbells which adjusts in 2.5lb increments. If you desire heavier weights the same thing is available as one Reebok Speed Pac 25-Pound Adjustable Single Dumbbell that adjusts at 5lb increments. There are several higher end brands(Powerblock & Stamina) which cost a lot more(>$150), but I found these at Target for $50.
Note:  Adjustable ankle weights may be more appropriate for those with wrist/forearm injuries