Pendulums and tarot cards are pretty easy to get ahold of, although they're not necessarily ritual tools. I think that good candles and incense are a good investment for rituals and making contact with demons. I think there was a ritual on the JoS website where you are able to use your index finger to invoke the Powers of Hell instead of an athame. I believe there may be athames and wands for sale in Wiccan online stores. I think a baphomet could be good too, I think I've seen pictures in frames in the satanic altars section of the website. A bowl to put paper and other things that you burn into. I like the idea of painting Satan's sigil onto a stone, I feel like that would be a more subtle way to have something representing Satan while making it easier to avoid detection from the kikes. There are instructions to making your own satanic rosary on the site as well.
Good luck.
Ave Satanas