Below are many, if not most, of the standard chords found in uke music. Here also, are a couple of other good chord sources if you can't find what you want here.
http://www.alligatorboogaloo.com/uke/chords/index.html
This is a downloadable PDF. Print it and carry it in your case.
http://www.meleukulele.com/PDFs/UkeChart.pdf