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.