I think you can still buy 8-5-8 SGs from some rare cigar dealers for $300-325/box ($12-13) dollars a stick. BTLs on the same sites are upwards of $20.
Some lucky bass-tards can find them for less! LOL
I suspect that the price of these will increase each year they are not made, and as the quantity available decreases (duh), but I think the BTL still has the edge simply because both sticks CAN be found, but the BTLs will cost more.