Check Craigs list and E-Bay for a used commercial slicer. I bought a Berkel 12" model a couple of years ago for $100, can slice anything I want at any thickness. Beats the *&%* out of those $100 to $200 toys.
I normally make my PP using 2 or 3 butts in either my New Braunfels offset smoker or my (sorry for the bad language) Bradley electric smoker. I just needed a bit of PP for a batch of the Hog Apple Baked Beans so thought I would try a 4.5 lb butt on the kettle. I started on half of the kettle...
I second the "Veg-O-Matic". We have worn out several. I watch at flea markets and such and buy when I find. You can put the potatoes through as fries and then lay back on and cut into uniform 1/4 to 3/8 inch cubes. We cut potatoes like this for our chili (I know, who puts potatoes in chili...