Creatively asking him for his number...?

Hello...I am 22 and a home depot cashier. There is a male customer that comes in all the time and we are always flirting like crazyy! It's gotten to the point where I'm pretty sure he buys extra just so he can come in to return it and talk to/flirt with me more. I want to give him my number (there is a reason he hasn't given me his yet or why he hasn't asked me for mine yet, not getting into it on here though) but I don't want to do it in the conventional way. What are some cute and creative ways to give it to him? The "here's my number text/call me" thing is just a little too boring for my style.