DDuMouchel you can always swap individual charms with board members. Just pm each other with your agreed upon swap and mail to each other. I have done this several times also outside of the organized charm swaps.
So if only 3 of you want to swap 2" charms do it among yourselves. I must have done this at some time as I have several baggies of 2" charms in my stash but not enough to make anything substantial.