where is all the SBP mags at?

i've got a full set of alum us indy slot mags in 14 x 7 in the 4'' bc . they are all polished and the slots sanded smooth for polishing or painting . i even have a odd pare of americans 14 x 6 3/4 call t70's . but i'd rather keep the american's , and trade my us indy's for two more american's . anyone out there ?