Check this previous thread --
As is mentioned here:
http://www.ticklingforum.com/showthread.php?t=88063
Velcro cuffs might be available at Spencer's, a store for the
(unusual, dark, crudely funny, etc.; much variety, from goth-dragon-or-demonic decor to Simpsons merchandise to rock stuff to the ultra-tasteless in sexually explicit paraphernalia...)
but if the hands are tied together with velcro cuffs, one hand can un-velcro the other wrist so the person isn't really totally helpless, though it may feel like it --
I don't have any of this stuff, myself, but
others here have said leather cuffs with padding of sorts are good too, so that wrists aren't chafed.
Metallic handcuffs (including "Kiddie" cuffs, which is oxymoronic, I'd never let kids near them, they can play cops & robbers without this stuff....) are not good unless there's some thick cloth wrapped around the wrists or whatever underneath,
between the metal and the skin, or it could hurt ---
The "kiddie" variety can be found in Eckerts or other large drug stores/toy stores and they have a safety latch also, at least ---- so if the person can manage to reach and pull the latch on the cuffs, if they're that desperate, there's always that "out" available,
also if they're not sure they want to be fully helpless
though it might not be that easy either...
Probably velcro might be better, won't hurt at all apparently...
There are loads of online sites for bondage gear (yeah, ok, I peeked)
and check that link above
🙂