There's a place here in Sierra Madre called E Waldo Ward which sells jellies, jams, and the like. They might have guava jelly or jam! https://www.waldoward.com/
If not, you might try some of the Hawaiian web sites. I have a friend who lives in Honolulu, and she always sends me jams and jellies from small island businesses. Hawaiian Sun Guava Jelly is available on Amazon as well.