@LisaLou - If you are visiting New Zealand between the first part of July and early October, you should get some Temple Basin ski time in.
I don't think the prices are unreasonable and pretty much what I expect to pay anywhere for a good day of skiing.
They have different prices for youth, students and adults. You can expect to pay anywhere from $20 - $70 per day depending on which category you fit in to.
They also have some modern lodges where you can spend the night if you want to ski more than one day. I would definitely call ahead and make sure they have room if you are interested in that.
I just went for the day, but talked to several people who were staying over night in the lodges.
You can get a lot of useful ski information from online sites before you go. The Temple Basin has 3 tow ropes, so if you are used to ski lifts, this might take a little getting used to.
There is also a free lift that will transport your gear to the top of the mountain if you don't want to carry it all the way.
If you get the chance to go, I would take advantage of it. It is an experience that you will never forget.