I tried walking with hand weights last week and have been doing it ever since. Just me, some running shoes, 2 x 1kg hand weights and off I go.
The 1kg soft hand weights were approximately $30.00, which is at the upper end of the scale.
However, you can find various hand weights at your local sports store for approximately $2.49 - $7.99ea, (0.5kg - 2.0kg) and these will do just as well.
I personally wouldn't recommend walking with 3kg or heavier hand weights but that's me. Some people probably use 5kg! I use it to get my heart rate up, not to get clanging biceps!
I have found that this is the best exercise I have ever done - better than aerobics!!
I used to think that people walking with hand weights looked like dorks. But...after I got over my fear of dorkness, I've never looked back.
Walking with Hand Weights is the Best Exercise