Price is zero because this isn’t a fixed item.
I, Leah Rowe, have some bitcoins that I’ve made from minifree bitcoin-based transactions.
Tell me how much bitcoin you want to buy and I’ll raise an invoice. NOTE: for tax regulation reasons, bitcoin sales are not subject to VAT since it is a simple currency exchange.
When you order, mention in the textbox on the checkout page exactly how many bitcoins you want: either a literal bitcoin amount, or tell me an amount in your national currency (EUR, GBP, USD etc).
I will give you bitcoins in exchange for national currency. You may pay in whatever currency you like, since my bank will just convert it to GBP when it hits minifree’s account.
Bitcoins are released upon completion of payment in exchange.