Nikon G Adapter

I tried search ebay for an Nikon G Adapter and the only ones that I found (based on the picture) are ones where you have to adjust the apeture manually on the adapter. Are there any that will allow the camera to set the aperture.

If I get one in which you have to adjust the aperture manually, does the camera meter properly? Does it record the aperture properly?

Are there any differences between the $20 versus the $50 versus the $80 adapters?

Thanks.