the only hairspray that I buy is Sebastian Shaper. Incredible hold, and it actually has a pleasant smell!! You can get it at Cosmetic World, and I think it's about $12.99... The bottle lasts me about 6 months, because you only need a tiny bit.
I think that Pantene makes some unscented products, but I'm honestly not sure. I'd have to agree though, finding hairsprays that are unscented is hard. Try asking the cosmetologist at Shoppers Drug Mart. They usually know their products pretty well.