Yes, you can get a short, walk around the store demo of the Trax 42 and other aids Costco offers (and a free hearing exam before that so the demo model can be set to your default needs). Then, if you decide you want to have a longer trial of a particular aid, you have to buy it. Your very own aids will then come in a week or two and you have the long trial period. When I got mine that was 90 days. Recent posts here say the trial period is now 180 days. During that time you can have appointments for adjustments and tweaks and by the end of your trial period you either keep the aids and Costco keeps your money, or you return the aids and get a refund.