DESPERATELY seeking seeds or cutting for this one. Willl trade or pay postage.
I have one red tropical hibiscus "President" I can trade.
There are over 8,000 cultivars of H, rosa sinensis.. did you have a particular one in mind?
I grow several hundred varieties, and some are currently available for trade as cuttings or small plants. Be aware that many exotic types need to be grafted, so cuttings of those won't be of any use to you unless you also have root-stock to graft to.
Here is a link that might be useful: Lone Star Chapter, American Hibiscus Society