Buying Quickened Spells, Price and conditions Options

[Moonstone Spider]

What is a reasonable price for a quickened spell on a mundane character? Assuming you already have an initiate magician contact, what conditions would there be to getting that spell? Would the magician worry about being traced through the spell? MitS suggests that quickened spells are very common in some areas, notably the Yakuza and Triads.

I've been thinking on this a bit recently. The best price I can come up with is force squared * 1000 nuyen. Thus a force 1 spell would cost only 1000 nuyen while a force 6 spell would cost 36,000 nuyen. Perhaps damage code should be listed in there too somewhere but too complex an equation gets annoying.

Lastly can the mundane recieving the spell pony up the Karma for it (Presumably decreasing the price), or must the magician do so?