I'm about to purchase a 4GB MMC card for my Nokia 6230 so I can use it like a cheap iPod nano for my law-enforced 2 hour commute to work. Can also use it in my digital camera then. US$142 shipped to Australia on ebay (Flashman852 I think is the seller). They just dropped about US$30 in price in the past couple of days.

But then some people are against Paypal/Ebay. Personally I've haven't had any major problems but I'm also fairly cautious. As long as you are patient and don't get into bidding wars I find ebay OK. The above mentioned ones are Buy-It-Now anyway.