I paid like 10-15 for my tiger, but TSNxRTC are a lot less common, and are really cool imo, its really what you want to spend. But you could try shrimp, bloodworms, nightcrawlers, take some tilapia fillets and cut em into small strips that it could eat. But don't over feed, if you get it, keeps the lights out for the rest of the night, and feed in the morning, while still keeping the lights out till you see some activity. Try feeding once a day till you have witnessed it eating, then you can bump up the feedings. Good luck on the mint monster. Beautiful fish!
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