(If I ever muster the intestinal fortitude to do a key-fob flogger made of keychain, I guess this is where it'll show up... In the meantime, we've occasionally got a deniably-large ball-chain clip whip here.)
Also see black double-foxtail rubber-chainmail d-ring collars here and here, and DIY project ideas for velcro d-ring collars and cuffs here.
$8 per flogger (total of two floggers available, in whatever format you like; could probably make more)
Want to be overt about it, but mini leather floggers don't really capture your personal taste? These are handmade rubber-thong cats (o'-ten-tails) with rubber-dipped handle, about 3" long.
The necklace cord is the same stuff the tails are made from, different diameter. I find a 18" necklace barely stretches enough to fit over my head; you may prefer one somewhat longer.
The jump rings on the necklace are gunmetal-finish, and on the earring more or less matches the surgical stainless steel post hardware ("white metal," silvery).
Sterling silver charms, surgical stainless steel posts (or SSS french hooks, or nickel-plate ball-chain necklace, or a combination, depending on your personal preference and topology).
A pair of handcuffs, and -- of course! -- two keys. No dilettante, no poser you: they'll know you mean business.
The handcuff charm is 40x15x2.5mm, key is 24x9x2mm. Both have good detail, and are 3D double-sided, not flat-stamped.
Actually, let me take a dollar or two off these for you. They're in A#1 condition, but are getting towards needing a polish.
Tiny (half-inch?) white-plate one-sided stamped brass charms, just for fun. Keys are attached with tiny keyrings (split rings), and you can have them in any of these combinations of hardware.