From one Canadian to another. You might want to try this company I have linked. The xmas design is the same product as the Halloween model and they are the cheapest I have found on the net. I'm not sure how much shipping would be. I was fortunate enough to get one bought and shipped by a generous Forum member in the States from a Tuesday Morning store. It seem that some Tuesday Morning stores have them for $7 or $8
Sound Activated Christmas Tree Lights - On Sale - Things for Christmas - Things You Never Knew Existed
Are you in BC by any chance? A few years ago our local Overwaitea (Save-on-Foods) had the Halloween version. Don't know if they still are available through them, but it might be worth a look. Mind you, we have to wait til the kids are back in school before any Halloween stuff hits the shelves.