If the 14" trim rings were available in a quality repo, I bet the retailers would ask $100 each. That is how I justified the $600 NOS ones.
As for the $90 repo seat piece... that is quite steep. I would think that NOS ones would be less than that. Honestly, having purchased a lot of NOS pieces for my car I have learnt this... I would much rather have a good original piece restored, than pay for a NOS part. Most of the time, even the NOS pieces need to be restored. As far as I'm concerned, you are money ahead restoring good original pieces, than buying repo junk, or NOS parts.