I do know one practice that was doing what you’re asking for, allowing two week trials of more than one brand, at least a few years ago before I moved away, and that was Audiology Associates in Deerfield, Illinois, but that’s a northern suburb and quite a drive from Plano. I wouldn’t personally want to take that on if there was something closer to where I lived, given that hearing aids need ongoing adjustment and service. (And by this point, their policy may have changed; you’d have to call and ask.) Have you tried searching audiologists by distance from you and just calling the closest ones around?
I bought my first aids with AA in Deerfield the way you want to do this, and I have to say that though I appreciated the opportunity to trial different brands, I found the outcome confusing to me personally. Part of the problem is that it takes your brain time to remap sound once you have new aids with a new fitting. So if you switch aids two weeks in, and then wait another two weeks to compare, you’re most likely going to conclude that the differences are minor, and that where there are differences, it’s a slight preference for pair A in a noisy setting, say, and a slight preference for pair B with music, and on balance, it’s a wash. Plus if you’d given the audiologist time to adjust the settings, maybe A would have improved with music and B in a crowd. Ultimately being able to try multiple aids may have reassured me that I was right to get hearing aids, but it wasn’t particularly helpful in choosing. And there’s no way to try every aid out there and make the best informed choice. When you hit pair three, you won’t remember exactly what pair one sounded like.
When I bought my most recent pair of aids, I told my audiologist what was important to me, listened carefully to his recommendation and reasons, why those aids matched what I wanted, searched the reviews here to confirm what he was saying, and bought the aids he recommended without a trial. And it worked out great. Using REM, he got the settings right on the first try. I don’t feel I need a trial of new aids anymore. There was a brief return privilege anyway, and I think Illinois has one written into state law.
If the trial is important to you, Costco is well worth considering, especially if you have one near Plano, and are a member (or don’t mind joining anyway). They are very good about taking aids back with minimal hassle, actually even months later, which is not going to be true with a private audiologist. And given that it takes a while to adjust to new hearing aids, that extended return privilege is great; they know you can only get a rough idea walking around the store for half an hour. However, they’re not going to let you take more than one or two pairs home, and even then, only one pair at a time. If you try and return two pairs, it’s not unusual to find yourself blacklisted at all Costcos from buying a third pair, for obvious reasons (you’re costing them money).