The clubs listed above will show retired breeding cats, such as http://rfci.org/adults.php
All the clubs I believe will list retired Adults, and many are sold for cost of spay/neuter, up to date on vaccinations, and if shipping costs are needed.
Also, you may check out Ragdoll Rescue, many in ragdoll rescue are not purebred, some are mixed breeds that may resemble a Ragdoll, http://www.freewebs.com/ragdollrescue/
You would be helping out rescue and finding a wonderful family member at the same time.
I don't have any adults available at this time, but there may be another breeder on the site that may have a retired breeder or young adult.