I like to buy and eat protestant/catholic altar bread sometimes. It is those small, round-shaped hosts of unleavened wheat bread, they are sold in our local protestant book-shop in package of 100 hosts (with price tag around 1.25$). Usually I eat whole package at once, it is very tasty.
I am now looking for Prosphora bread to buy and taste in the similar manner. I have found so many web pages with recipes, there are lot of prosphora stamps for sale on ebay and Amazon and any other place. But I have not found any single webpage which would offer Prosphora for sale!
Is it really prohibited to sell and buy Prosphora? Generally - there are no such rules for protestant and catholic altar bread which is not consecrated. I understand that it may be a bit more tricky with Prosphora, because is is (more or less strictly) required to use holy water for baking. But anyway - quasi-Prospohra (baked with the usual water instead of holy water) is definitely the good without any meaningful restrictions, but I can not find them either.
So - why Prosphora is not available for sale or any other transaction (e.g. against donation)?