how much should i sell 644 air runes, 300 body runes, 300 water runes, and 100 earth runes for :?:

Not much.... Lol.

Air runes are like 10-15gp each now, Body runes are about 10gp each more or less, and the same for Waters and Earths. Most people like to buy in bulks of 1,000+ though, so good luck...