Whole wide variety of price ranges here
-Captains of Crush Grippers of various resistance levels
-"Powerlifting Basics: Texas Style" By Paul Kelso. Phenomenal read.
-"Super Squats" By Randall Strossen. Another great book.
-Lifting straps (Big fan of the Ironmind Strong Enough straps)
-Rolling thunder handle
That'll probably keep you busy for a while. I have a pretty well stocked home gym, so if you're wanting more ideas, just let me know.