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A few years ago the lady that had a local clarinet studio showed me a case full of Rico clarinet mouthpieces that they were allowing her to sample (with the obvious intention of having her direct her students toward their mouthpieces).

Does anything like this exist for brass mouthpieces?

I would love to experiment with a Bach 18, 22, 24AW, etc. without having to purchase a whole stable of expensive mouthpieces.
Do you know of any music stores that might provide such samples? Even if they needed to be kept in-house, I'd be fine taking a road trip to gain such a valuable experience.

Baltimore Brass, but that's quite a haul for you..................

Talk to Dan "TubaTinker" Schulz and see what he has- he's in Newburgh, near Evansville.

Lee Stofer in Kamanche Iowa had a boat load of mouthpieces last time I visited.
That's a little closer to you than Baltimore.