I'll say.
Peter, I know you said you don't have the boxes so you don't want to ship but you might want to check with FedEx, UPS, or a third party (we have a place around here called Box Depot) and see what they would charge to box the speakers up and ship them. FexEx has an option to ship ground at freight prices for large items.
That way you don't have to build the boxes but do have the ability to ship which could open this up to more people. Buyer pays shipping expenses of course.