Well, if you're ever thinking of upgrading your bathroom a waterless urinal is about $400 +/-.
An immediate inexpensive solution is a dual flush retrofit kit, you can add it to virtually ANY toilet for cheap, like $30 or so.
Then there's always employing the "if it's yellow let it mellow if it's brown flush it down" philosophy as a household rule

(although my husband thinks that may be hard on the porcelain, frankly I know our current toilet is older than me so who gives a ). With that particular method you might want to put TP in the trash ... of course, then that goes into a land fill so there's no winning, is there?