That's kind of like asking why does one car dealer sell model Jem-a and another model Jem-b, they look the same but there is so much difference in the price, well perhaps one is a reseller and another manufactured it. When it comes to manufacturing there can be differences in cost as well depending on the machinery used and the quality of the wood which will add or take away from the cost as well.
Your best bet is to ask yourself if your going to swirl it then what kind of wood do I want under the paint because the originals were mainly Basswood from what I understand but some have surfaced with other woods hiding under there.