Stock Footage Vendors & PD Films - Had Any Experiences?

[misteranalog]

There are companies that sell transfer copies of PD films, such as Heavenfireinc.com and Retrofilmvault.com and others.
Some sell only to organizations such as broadcasters, others will sell to individuals.
However, several do not show any stills of the films they sell.
Has anybody had direct experiences with these companies or similar organizations?