I have old Mario figures from the "good old days." They include: Mario with a veggie, Mario picking a veggie, Mario with a hammer (and no hat), Mario climbing a vine, Luigi, Priness Toadstool, and Bowser (which was actually a "Mario Trophy" I took apart to make a figure to play with). I know I used to have Mario shooting a fireball and Mario with a mushroom.
From McDonalds, I still have Mario and Paratroopa. I used to have Goomba and Luigi, too.
And, my favorite, from MK64, I have really cool figures of Mario, Luigi, Bowser, DK, Wario, and Yoshi.
I also bought a Cranky Kong and a Diddy Kong figure.
I bought plush dolls of Mario and Luigi and bean-bag toys of Mario, Luigi, Yoshi (green), Bowser, Wario, Toad, DK, and Diddy Kong.
If you're looking for stuff, try e-Bay. On second thought, DON'T try e-Bay, because I want the stuff there!! Just kidding.
Mario figures...I'm hoping SSBM will ispire some more, including a bunch of non-Mario Nintendo characters!