Feeder rodents & insects in a variety of sizes. That will potentially help you build up a "regular" customer base.
If you're only going to stock dry goods, how do you plan to get people through the door? You're setting up a retail store for a niche market, and I think you'll find that the prices you have to ask on supplies to cover your overhead might be more than many people want to pay.
Even in the established, independent store which was well-known for being the best in the area, we'd hear "Oh I can get it cheaper online" all too frequently. Pet retail is *tough* no matter which way you slice it. Not trying to discourage you, either...just be prepared to burn through that $20k faster than you'd think.
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