Yeah, I get it done through my uni, and it's nearly 200 bucks after all the bleaching's involved, too. (Sure wish I had blonde hair so I could skip the step.) So, do my best to keep it fresh as long as possible... usually can stretch it reasonably out to about four-ish months, being diligent.
Also, you never manage to get the anime look down, unfortunately... I love the hairs of some of those girls, but, man, unrealistic hair standards.