OK - here's the deal on the Hi-Lo accessories.
Apparently, the original BTP Hi-Lo accessories were produced on 49mm ceramic dealer button blanks. Those are considerably more expensive than a chip (about 3x to 4x the price). Here's what I'll do, because it seems that different people use these Hi-Lo items in different ways.
The default size will be a 47mm chip. If this is the size you want, you just place your order and you are done. However, if you want to buy a 49mm button size, or a smaller chip (39mm or 43mm), you need to let me know either in your order post or via PM. The minimum order quantity for chips (any size) is 25, which includes printing on the rolling edge. The minimum order quantity for the 49mm dealer button size is 10 if you want printing on the rolling edge (it will be plain white with an order less than 10).
I will update the OP with this information, as well.