I think Sacd01 advertises them here at A'gon for about $10 each. I know nothing about them.
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Well, I have a collection of 1000+ 45's (or 7"s as I call them!), but not many of the stereo/mono variety you mention. Most of mine were issued anywhere from the late 1970s up to last week.
But from what I've seen (in shops and online catalogs), a lot of the older ones--especially white-label or DJ promos--can go for crazy amounts of money. I don't know of any price guide specific to promo 45's. Might Goldmine or Record Collector (neither of which I read) contain such info?