Interesting to see this thread burst back into life... clearly current prices are an issue for people (me as well).
I'm still trying to formulate the ideas - but I'm sure there is something that a 'popular' website could do to make cartridge pricing more transparent and create some competition in the market. Either by marking the prices, or creating competition.
One idea could be to get cartidge resellers to post their prices here - it would be free advertising, they could expose special offers (maybe even small special offers for ShootClay) and we'd have a good resource to find the best opportunities to save money.
Phil - I'd be happy to publish your lists - and I'd love to get them from other retailers... justcartridges have ignored my mails, as have claysrus - but there are others who maybe forthcoming. A cartridge price forum would be easy to add - if I could get enough retailers/resellers on board.