It doesn't hurt to ask. A lot of stores offer refunds on items you purchase if it goes on sale within 2-6 weeks of purchase. They don't usually offer that info but it will be somewhere in their purchase and returns policy statement.
$24 bucks? If it went down $100 bucks then I would be angry.
remember, everything you buy except your house and colelctables, WILL go down in price. If you dont agree with me, I have a bunch of 486's for $4000 you can buy.