There never seems to be any decent Martial Artists Attacks in any shop (ie bird of prey). I'm not exactly sure how the shop system updates but if it is waiting for Angel of Night to sell before it refreshes this could be why there is never anything for sale...otherwise it is just because the MA attacks are snatched up every time the shop refreshes. Perhaps the number and type of MA attacks that appear could be upped....especially since they are all NO DROP...so we can't buy it anywhere else and they are a pain to get on team missions because of the no drop....
Also concerning NO DROP items It would make things so much easier if there was a special way that NO DROP items could be transferred from one person to another...like a special terminal, or sending items through the bank....or even a zone where NO DROPs are turned off and can be treated like normal items. This would allow organization such as my Martial Artists org to implement their hand-me-down system with MA attacks as well as with weapons and armor.