I bought a small pump used for inflatable mattresses, it blew the balloon up too quickly and they popped, so I tookn out the pump motor and replaced it with a smaller one, changed the battery to a smaller size (2AA's) and a bit cable with pressure switch so that pressing the nozzle down activates the pump...now I have one that is about the size of a 1/2 20oz bottle of cola that works almost perfectly.

-t