How rare are pre PCGS David Hall sealed and graded plastic flips?

I have only seen a few of these in my ten years of being in coins. This one is a 1938-D Buffalo Nickel graded GEM UNC. Mint State 65. How rare are these and how much are they worth? How high is the interest in these holders for those who are holder collectors?
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Here's a sequential pair I got this week...
I would pay a little extra for one but not too much.
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They look vinyl. Do any of the coins show PVC residue?
The coins are encapsulated and then put into the vinyl flip.
Quite a bit of them have popped up over the past 6 months...they may be from someones old collection that was liquidated.
I have seen an uptick as well.
Choice Numismatics www.ChoiceCoin.com
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I have only seen a few of these in my ten years of being in coins. This one is a 1938-D Buffalo Nickel graded GEM UNC. Mint State 65. How rare are these and how much are they worth? How high is the interest in these holders for those who are holder collectors?
I own eleven of them myself, all common coins, but every one graded MS-65. About seven or eight years ago, a small hoard of 24 showed up in a local auction and I placed what should have been a STRONG bid... and got blown out of the water.
On the web: http://www.earlyus.com
Grading standards were tighter back then. Could be some low hanging fruit.
Hard to say when things were tighter and when they were looser. I tried to sell an MS-65 Morgan dollar in one of these flips to Mr. Hall at the Central States show in the south suburbs of Kansas City back in 1989 and he told me that those grades were not effective any more.