Different condom sizes?

My boyfriend and I want to have but there is one problem: I'm VERY allergic to latex and the non-latex condoms I have are too small for him. I currently have Trojan's Supra polyurethane condoms. I'm guessing they're normal size (I've only used latex twice) but I need something a little bigger. I've looked at all the normal grocery stores but even then sometimes only find latex. Are there large non-latex condoms out there? Thanks!