This is the lowest cost MicroSD card that I have seen. If you've been debating the benefits of adding a memory card to the 8100, this lowers the cost.
ATP 256MB microSD Secure Digital Card w/ USB Reader
Buy.com price: $15.00
$15.00 Mail-in Rebate
$0.00 After Rebate Buy.com - ATP 256MB microSD Secure Digital Card w/ USB Reader - AF256UD-CRS2
I received this offer in an email and do not have any affilation with buy.com or ATP other than being a customer.