I don't know if Henny Penny is still made or if they were bought out by one of the other manufacturers. If it is an old one have it checked out by your the person that does your equipment repair. They should be able to tell you if it is in good working order.
The top of the line holding cabinets are made by Alto-Sham. Cres Cor and Traulsen are good brands also. If you can get them used. I wouldn't pay more than half of original cost.
Team: Pyle's BBQ; Yoder YS640; Good-One "Trail Boss" 60T; Weber Kettle w/rotisserie ring; Big A$$ Rotisserie; Weber OTS; New Braunfels offset smoker.
Saddles BBQ Bistro