Please Help

I've already seen "Silent Night, Deadly Night" and "Silent Night, Deadly Night Part 2" (happy because "Silent Night, Deadly Night" and "Silend Night, Deadly Night Part 2" are on the same DVD that I rented from my local Blockbuster Video Store), but I haven't been able to find "Silent Night, Deadly Night 3: Better Watch Out!", "Silent Night, Deadly Night 4", and "Silent Night, Deadly Night 5: The Toy Maker" on DVD or VHS to rent or to buy. Does anyone know where I can buy or rent those movie said from the list above? If anyone can help me, I would really appreciate it. I live in Hillsboro, OR (1/2 hour driving distance west of Portland, OR) if that will help.