What are some good gift ideas for students from their tennis coach?

I have about 25 kid students that I do private tennis lessons with. I’ve been doing lessons with them for a long time but now I’m moving states so I have to let them go :( what are some good gift ideas that won’t make me broke? The ages range from 7-16 I thought about getting reusable water bottles with their... show more I have about 25 kid students that I do private tennis lessons with. I’ve been doing lessons with them for a long time but now I’m moving states so I have to let them go :( what are some good gift ideas that won’t make me broke? The ages range from 7-16

I thought about getting reusable water bottles with their names engraved and some candy inside. If I can buy things in bulk and keep it to max $10 each kid that would be great.

Any other ideas?
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