How much do you pay for hash?

[3 Sheets To The Wind]

an ounce of dirt hash would be that price, no matter what he tells u it is soap
an ounce of some real nice afgaan or morrocan black type hashes can fetch £160 an oz in uk, but no way should u be paying that price for soapbar

So why did i get a Q of great hash for £12.50?
It's from the same plant i get my bud from, it's great stuff, so an ounce of it would be £35-40