Laptop mice are, by nature, expensive. 5 button mice are also, by nature, expensive. 5-button laptop mice, if they even exist, are ridiculously expensive.
I would go with a Logitech MX510. You can get one for 22$ and Amazon, and it's still one of the best gaming mice available. Of course, it's corded, but that's a small price to pay for top-notch performance. Compgeeks.com also has a refurbished Logitech Cordless Click! mouse for 13$, which is nice if you do'nt mind forgoeing the extra buttons.