They retailed at $80*. So if he is trying to get rid of them, why would he sell at full retail? Ask for a 50% discount and see what he does. You should be able to get a better deal if you buy lots of them off of him. You could probably sell them easy for $50, $60-$70 is possible but it will take longer. So if it were me, $50 would be my highest offer, if your sole purpose is to resale.
Your target customer is someone who is newer to yoyoing, since most of those who have played with a smaller yoyo have already had the novelty wear off. Small yoyo’s are like hubstacks, they are great fun for 30 minutes then they only get played with once in a great while. Those who know that won’t pay much, but someone who hasn’t played with one will pay more.
*Source: YYN - Big Deal