I would say that York is the odd show out as it takes advantage of the PA Sales Tax "loophole" allowing members to sell to other members with out needing to have a PA Tax Certificate or collect and send in PA sales tax.
I presume Allentown follows the traditional route where everyone selling, whether a "dealer organization" or a "private individual" must have a PA Tax Certificate and collect and send in PA sales tax. Whether the tax is included in the "price" or added on depends upon the seller.
