I'm not sure what the price you saw included, it should probably say that somewhere near the price.
Registration is typically $35, but they very, very frequently run promotions which waive the registration fee. When I joined they were running one, and I know they were running one recently - maybe you can hold off joining formally until they're running another? And just follow the program based on public info found here for now? (If the money is an issue.)
For attending meetings, you have three options. If you want to go to meetings but don't want to pay for a bunch at once, you can pay $12 per meeting. You can also buy a multi-week meeting pass, good for 10 weeks, and it averages out to $10-something per week. The third option is a monthly pass, which also gives you access to eTools and all the WW Online stuff, and that averages out to about $9 per meeting (so it is cheapest, includes the most perks, but requires a greater commitment).
Those are what I know of - I know you can also subscribe to WW@home, or just eTools alone... but since I'm a meeting-goer I don't know how much those would cost.