I almost feel like putting this on my DIY blog, because it's all about building your own tools to extend your power. I didn't do the building in this case, though.
I found out about the Wiisniper blog, the owner of which has built a variety of Google widgets that let you search for specific Wii products. I put the Wii Fit widget on my iGoogle home page, and found a shop that had it in stock tonight. Actually, they don't have it in stock — they're allowing back orders — but that's fine by me. And it's not even either of the shops that annoyed me so much yesterday.
What I learned from this: Revenge is sweet. Also a reminder that the power of the internet comes from both the wide range of information available and the ability to compile and synthesise information.