Valuing Capped Bust Quarters by Browning Number

I've got a set of Reduced Size Capped Bust Quarters (1831-1838) by Browning Number missing just the two rarest varieties.
All are in either PCGS or NGC slabs.
I'm going to sell them but can't find values by Browning Number.

Is there such a listing or some other helpful valuing site?

I assume any listings just by date are for the value of the R-1 or R-2 varieties.
About 10 of my set are either R-4 or R-5 so I think they would be worth more than the listed values for the common varieties.

 

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COINFACTS list many of them by Browning numbers and some auction results. Look for the link Show Related Coins and Varieties

 

I've found the premiums start at R-4s, up to 50% premium for the grade. R-5 up to 100% premium. As long as they are XF and better.

 

To both of you, thanks for the info.