I'd wait another day, maybe two...After all, he probably would like to get the money from you, so it wouldn't make sense for him to ignore you.
But in the meantime I'd check to see what else he has for sale-- "See Sellers other items" just to see if he's listed anything in the last day or two. It would be odd if he had computer access to list more stuff but didn't have time to respond to your emails. If he hasn't listed other stuff, maybe he's had a legitimate difficulty in accessing his email.
In the meantime, just send the amount to
me, in fact you'd better double it, so I can send it to my Nigerian bank associates.
