So is this at least going to be tax free if you buy from a yard sale instead of the actual market board? Would make it somewhat useful.

Also now that I'm thinking of taxes how is it going to work if its not tax free? Say on the market board your retainer is listed as selling in Limsa but it's at your house in Gridania. You buy from it on the lawn of the house. Do you have to pay the extra amount because it is listed in limsa even though your standing right in front of it?