UPDATE: I wrote to Amazon about this issue and they've agreed to refund the difference in price. Kudos to Amazon for such a quick response and for refunding the $17.
Typical, just typical. On Tuesday I ordered one of those hard to find component video cables from Amazon.com for my Nintendo Wii so I can enjoy 480p visuals on my new HDTV, and what does Amazon go and do? They put the cables on sale today for $13. I paid $30 for my cable (which arrives today). Ah, if only I'd waited. This kind of thing happens all the time. I can't tell you how many games and accessories I've purchased over the years that have either gone on sale or become discounted Greatest Hits / Player's Choice titles one week later.