1lb of chalk for $25.95 from amazon.
no, the chalk is different. gym chalk is magnesium carbonate and sidewalk chalk is calcium carbonate. sidewalk chalk dissolves in water, whereas gym chalk does not. i personally use primo, because it doesnt make my skin dry out after a workout. lifehack, if you're thinking about using liquid chalk, just mix powdered chalk with some rubbing alcohol. i mix mine into a paste in a condiment bottle.