Chalk
Chalking the hands will dry them out and can damage the skin over time. If attention is not paid to recovery, this damage will accumulate and increase the risk of skin tears. A similar impact on performance can be achieved by using rubbing alcohol to clean both the hand and lifting implement of any sweat or oil prior to each attempt at a lift.
Chalk can be purchased in most sporting goods or outdoors stores. A 1lb box of 8 blocks will last a long time and should be under $10. Be sure to get gymnastic chalk (Magnesium Carbonate) and not pool chalk or playground chalk. Some gyms have a policy against allowing the use of chalk. A resin ball, a chalk ball, or spray on chalk can be tried in those locations as discrete alternatives.