I've found myself in need of a cartridge for my table. I've looked at several sources and haven't been able to determine which I should purchase, or what is a good price. I've come upon cartridges for $40 to $2600 dollars. I'm not trying to spend to much money on this cartridge, ideally I could pick up a good cartridge for less than $100 bucks.

So any suggestions for cartridges, or good places to look for them?

Also, what should I be looking for? Why would someone pay $2600 on a cartridge?