I just looked at their site, and prices have increased from $150 to $180 for the starter kit, so I'd jump on $130. That's what we got it for (incl. shipping) late last year.
It only comes with one nozzle. Recommendations for 24 x 24 x 48 enclosures are 2 nozzles per, so you'll likely need 5 more. Exactly which ones and extras will depend on how you configure them (serial, parallel, single or double nozzles, etc.) Same goes for extra tubing, nozzle mounts (wedges), tubing clips, etc.
If you are trying to get everything in one order, I'd suggest working all this out ahead of time with schematics. If you don't mind getting the unit and becoming familiar with it, and then figuring out what else you'll need and putting in an order for extras, that works too.