Cheap personalised/printed t-shirts?

[oxcat1]

Hello,

I'm trying to get 25 t-shirts printed for a group of children that I took on a trip. I want to do it as a thank-you to them for being so well-behaved, but I'm rather staggered by the prices. Any idea where I can get them done for less than £5 per head??! Ideally I'd like grey, with red printing on either the front or back. The children are aged 8-18 so a fairly wide size range, although the younger ones could just have big ones to grow into.

Any thoughts?