Chalk

Talk is cheap... but here at Crank Factory, chalk is cheaper. 

Climbing chalk is basically magnesium carbonate, but some brands may add their unique blend of binding and drying agents, which will result in slightly different texture, drying properties and prices.

The most value-for-money option would be GIGA-BITE Loose Chalk in a resealable ziploc bag, retailing at $16 for 450g ($0.035/g). The SO ILL Prescription Chalk retailing at $19 for 500g ($0.038/g) is also favoured as it is held extra-safely in a plastic twist-lid container.

For chalk balls, we are big fans of Metolius Super Chalk Ball (Refillable), which is $8 for a extremely well-made sock that'll last almost forever.