Well, besides places like Michael's, there's always awma.com or other martial arts product sites.
The karate belts would be good for tying ...and I bet the Kung-Fu sashes would be good for blindfolds .
And I rember a pointy (but more blunt that pointy..) tiny weapon called a "kubotan" (or something like that..)...it's just some hard thing that's about a ft long (or is that half a foot long?)..that you can carry on your keychain, and use as a weapon. Not great for knockout blows, but can still cause a good amount of pain in an attacker.
One Kubotan is the "ninja" one martial arts sites sell...it has a least three slightly pointy ends ..not bad enough to kill, but I bet it'd make a good tickling tool.
Then there are the leg stretching machines...they seem small enough to be portable...now, imagine your legs spread ALMOST as far as they can go..and tied to the machine...now anyone near ya has access to almost your whole legs /feet (except for the bottom of the legs, of course, since you're sitting down)
And I mentioned the "focus mitts" in the "favorite bondage positions" thread.
Oh, and can't forget the ninja "grappling hook", too...with 33 ft of rope!😀 ...not to mention the split-toed socks are nylon.