Check the listing for details. 10PK Retainer Case, Denture Storage Box, Mouthguard Container, Aligner Case. Condition: New, Made in United States. Listed at 15.80 USD. Maintain your orthodontic devices safe and protected anywhere you go. No more wrapping your aligner in a yucky napkin or sticking it directly in your back pocket! No more lost retainers! AIM aligner cases are the best in the industry: easy to open, easy to close, and easy to clean.