One is the original Eames Molded Plastic Rocker and it's retail price is $479.00. The other is a knock off and cost only $153.99.
If you were a serious collector the real deal is a great piece to have but if you just think its a fun chair then I say go for the lesser price one so you can buy another cool piece for your room!
(The first photo is the real deal and you can find the chair at Design Within Reach.)
The second photo is the price saver from Overstock.com.)