Hi girls, was hoping someone good with words could help me come up with something clever for an I.O.U?

It's my Mum's birthday tomorrow, we're taking her out for dinner but unfortunately I can't give her her birthday pressie on the day. She knows this, she asked for a wet & dry dust buster (saw mine & just LOVED it!), I explained that if she wanted it I'd have to wait til pay day.

So she's not expecting it but I was still going to write a little I.O.U to put in her card

I've got nothing! Hopefully one of you lovely ladies can help me!