There used to be a Dual Speed Crayford Focuser from Lunt with slightly less travel, which was about half the price of the GSO one. As mentioned in this post, it is supposed to work with the ST80, but I have not tried it personally ....
I bought 2 of the $70 Lunt 2" Crayford focusers (still available), and put one on the Meade ST80. It fit this scope without any adjustments needed. The other Lunt 2" Crayford is on my 102mm f/9.8 achro, but I needed to have a machinist at our university adjust the stock focuser adapter of the this scope to fit the focuser.
I have a 2" GSO dual-speed Crayford on the Orion ST80.
I like the 2" focusers, but I could have just used the 1.25" on the ST80s since I mostly use 1.25" eyepieces in those scopes. The good thing about having only 2" focusers is not having to have duplicate filters and Barlows. All of my scopes have 2" focusers now, except a little 70mm f/5.7 achro and a 114mm f/4.4 reflector.