Basically none unless you want a truck trans.
I believe Richmond makes a 5 and a 6 speed that can be had with a Mopar input shaft but the bell housing and everything else is up to you. Check out Summit or Jegs for them.
Additionally there are 5 speed conversion kits available from Kiesler but they are very pricey, well so are the Richmond transmissions plus everything else that you have to have with them.
There is no easy bolt up to my knowledge unless you go with a truck transmission.