As far as I know neither amigakit or vesalia has any, if you are no stranger to soldering you can get pretty much any joystick you can find working on Amiga, it's quite easy to get hands on genesis/megadrive joysticks for low prices and they are easy to modify tho they are a lot bigger then the miggy joysticks

If you can get/build a housing there are quite easy to build and use arcade joystick parts and ebay is full of buttons and sticks.
The Competition Pro USB joysticks are new and you can open em up and solder wires manually to use it for Amiga.
Other then soldering and building I don't know of any new sources. but the genesis/megadrive joysticks are easiest to get running and easy to get hold of.