i found a site that makes them. we can order however many we would like. i figured to hand them out, we would go in order of how teams placed at doubles. first place team got 1 and 2, they could decide who got what, and so on. then you challenge other people whenever or on doubles days, they can all be collected and redistributed according to place again so you can challenge more people at once.
The cost varies depending on how many we ordered, but rosie and i thought of charging right around $10 per tag, and any money that is leftover after all the tags are ordered can be donated to the deerfield course.
i have a tag on my bag simular to the ones i found, i'll show it off a bit at doubles on fri and sat and start getting a list of who all would be interested. they take about two weeks at least to be shipped so i'd like to order them in the next 2-3 weeks if everyone likes the idea.