Are you looking at private lessons, or group? Our LQS charges $25/hour for private lessons, you bring your own machine etc. Also, your LQS should offer lessons. You can divide the price by number of hours the class is long. Then decide what the minimum number of students would be.
Some folks rent their Long Arms, but I haven't heard of renting regular machines & other equip. I'll be curious to see what the replies to this are.