For the parents on my flist...
Target.com has some great sale prices on carseats this week. They're on sale, plus an additional 10% off coupon code (TCHFKFCN). You will pay sales tax and shipping, however.
Some of the deals I noticed (note, sometimes the price is different depending on the cover):
Some Roundabouts are $178
Marathons as low as $239
Parkway for $89
Sunshine Kids Radian is $180
Recaro Young Style $117
All those prices are before coupon, shipping and tax are calculated. There could be some other really good deals, that I didn't notice, because I haven't kept up to date on pricing lately.