Mostly just random BDSM gear I have gathered over the years:

Lots of bondage rope, obviously. Most of it is the cheap stuff from Amazon tho, I would love to upgrade to something nicer.

Two pairs of leather handcuffs, they work for ankles too.

Two pairs of nipple clamps. Normal ones and clover clamps (they bite harder when pulled). Putting clothespins on my nipples as a horny teenager is how I originally started discovering BDSM and I’m still a huge fan of nipple play.

A ball gag. I’m personally not a fan of the drooling and stuff it causes, but some people find that very hot.

Wartenberg wheel, rolling it over sensitive body parts can cause a surprising amount of pain considering it’s originally designed as a medical tool.

A shock collar (PiShock, but nowadays I would recommend looking into OpenShock instead). It can be controlled remotely over the internet, allowing long-distance play. I sometimes boast about having a high pain tolerance but that thing can make me beg in no time. I can take single shocks even in the higher settings but getting shocked in the same spot again and again makes the pain way worse every time.

Blindfolds. I don’t exactly remember where I got them but I think most of them are just regular sleeping masks… But hey, they work so why pay for anything more expensive?

Other random bits and pieces I can’t remember right now. Many normal household items are useful too. Belts and clothespins are first that come to mind.