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I bought the DGtle TPU for a whopping $6 from Amazon. Feels pretty solid so far, and the rubber material provides a nice anti-slip surface. DGtle Anti-Scratches TPU Gel Slim Flexible Soft Bumper Rubber Protective Case for Google Pixel XL - Clear [link]
I bought a random clear TPU case from Amazon, fits the phone perfectly, cost like 6 bucks.
Edit: Here is the Amazon Link [link] and it was actually $7.99
This is what I bought and it works great.