You're probably going to want to buy a fairly good-sized SD card if you plan on downloading VC games. The Wii doesn't have much onboard memory to store games on. Try a place like Newegg to get the best value for your money. That's where I bought my SD card.
The eBay auction you linked to has $8 of shipping tacked on. The person running that auction will make $4.50 extra just by jacking up the shipping cost (effectively doubling their profit)... not a business practice I'd like to support.
Try this one: Kingston Standard 2GB Secure Digital (SD) Flash Card - Retail at Newegg.com
It's the same price ($27.99) and only $4.99 for shipping.