Looking at the prices on Ebay, looks like the grips are going for around $20 each. I need to get grips for under the shutter, around the back wheel, and around the plug insert area so that comes out to around $60USD. If Canon would do it for cheaper, I wouldn't mind driving ~30 minutes to drop it off in Newport News. I'll give Canon a call today and see what they tell me.
Let us know what they tell you!