You can buy variety packs of Earth's Best at Babies R Us and there's always a coupon on there for $ off the next one you buy. When you buy Earth's Best cereal, there's a coupon for $1.00 off 10 jars. Whenever I buy Earth's Best at the store I get one of those checkout coupons for $ off of Gerber Tender Harvest. Whole Foods sometimes has it on sale here (NJ) and gives you a discount if you buy it in bulk. So, between all of those, I generally don't pay a whole lot more than I would for "normal" baby food.
Also, FWIW, Consumer Reports just published a big article on organic in the February 2006 issue and said, in their opinion, it is worth buying organic baby food.
HTH