I've searched high and low for a reasonably priced one too.. But have yet to find it. Then I read Gina Ford's book, which doesn't recommend it as it can turn into a bad habit for the baby. Not to mention I realized my baby's room is just too small for one!
If u don't mind a 2nd hand chair, there is an ad for a Dutailier rocker on asiaxpat.com -> classified -> babies and kids stuff. The ad was posted on Sept 16, and is on p.19 as i type. But it gets pushed back as more new ads are added. Seller asking $2500 and says it's in excellent condition. Good luck!