Ok ok.. let's not turn this into a pissing match. Basically it doesn't matter if it's USD or BTC. You can set a products option for different values for different options. So if you have batch 1 and batch 2 set as options for the product you can set batch one, if chosen, to be priced at $5 and batch 2, if chosen, to be set at $5.50. Or whatever price your little heart desires 