I really think it differs with each center from what I've read.. I joined last thursday and that week they were running a special (which I hear they do all the time) and it was 1/2 off so it cost me 149.00 to join.. so that might give you an indication, but I hear they will work with budgets too so again I really think it depends on the center etc.. so I would recommend going, getting your consult and see what they tell you, if they aren't running a special now they will soon I'm sure!
(also my joining fee doesn't include any supplements you might buy, the only ones mandatory are the HNS's which are protein drinks and they have several prices depending on how many you want to buy at a time, so you can buy by the week or by the month, which ever is easier
hope that helps!