EF-EOS R Adapters... Accurate Pricing?

Is this pricing accurate from B&H for the EF>R lens adapters? The control ring version is the cheapest, but the plain "dumb" adapter is the most expensive?

As of right now, they are listed as follows:

$199.00
Canon Control Ring Mount Adapter EF-EOS R
B&H # CAMAEFRFCR MFR # 2972C002
Canon EF/EF-S Lens to EOS R Camera
Maintains AF and Image Stabilization
Configurable Control Ring
Dust- and Water-Resistant

$299.00
Canon Drop-In Filter Mount Adapter EF-EOS R with Variable ND Filter
B&H # CAMAEFRFDIND MFR # 3443C002
Canon EF/EF-S Lens to EOS R Camera
Maintains AF and Image Stabilization
Includes Drop-In Variable ND Filter A
Dust- and Water-Resistant

$399.00
Canon Mount Adapter EF-EOS R
B&H # CAMAEFRF MFR # 2971C002
Canon EF/EF-S Lens to EOS R Camera
Maintains AF and Image Stabilization
Dust- and Water-Resistant

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