The domain name retainer(.)org is for-sale.

Google = 6.4 million results for the word 'retainer'

retainer

1. a fee paid to secure services, as of a lawyer.
2. a servant or attendant who has served a family for many years.
3. Also called cage, separator. Machinery. a ring separating, and moving with, balls or rollers in a bearing.
4. Orthodontics.
a. a fixed or removable device worn in the mouth to hold the teeth in their new position during the adaptive period after straightening appliances have been removed.
b. Prosthodontics. a part on a bridge or the like by which the bridge is attached to the natural teeth.

bin: $3,500