Ahh- I was going to ask what you were doing.
I think it is a huge rip-off - they way they have managed this.
Basically a company (I'll have to get the exact name once I am home) has all the accomodation in their pocket- so you have to book thru them. The prices are definitely jacked up for that week. There are many motels that have kitchenettes- the closer to the venue the more expensive of course.
Once I get home I will give you the name of the company but also the place my sister stayed- it was a Mom and Pop motel- nothing fancy but had a kitchenette and I know they were not part of the other company so their prices were more reasonable.
Again- once I am home I will check the names for you- you do want to book anytime now as closer there may not be much left- typically accomodation right in Penticton are sold out.