This guy helped me a lot, how should I thank him?

I wasn't able to attend my course for a month now, and this guy whom I've talked to only once been recording the whole session and sending them to me without I even ask for it.

I've thanked him every time, but I feel like I should get him something? I would've treated him to something delicious but I don't want him to get a wrong idea, so what should I get him?

This guy helped me a lot, how should I thank him?
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