Upload & Sell: On
I got the little B9 plate for my OM-D. Works well, sits flat (even with lenses mounted), and works on the bare camera, horizontal grip or vertical grip. Sure it's small and not an L-plate, but it works well, prevents twisting and adds almost zero weight.
$190 isn't bad considering the L plate is part of it. A typical RRS or Kirk custom L plate is in the $140 range. Yes, it's very expensive for milled aluminum, but it is what it is...my little tiny plate was $55 and it's an inch square. Welcome to the high price of the arca-swiss system. Pretty much standard: standard plate for $55, L plate for $140, or $200+ for pro-style L plates or plates for accessory grips.