I don't mind pointing people in the right direction, or I could get some made up, I use streetshirts.co.uk for things like daft tour t-shirts and also had some work stuff branded up by them. There is probably someone on here who does this as a business though.
It is really easy though
https://www.streetshirts.co.uk/design-your-own-t-shirts like I say though, I don't mind helping out and ordering a couple if people wanted one.