Value Of Ipsa Stamps: Independant Postal System Of America

Hi! Happy New Year to all!. I came across a full album of fdc and stamp of each fdc of IPSA , that is Independant Postal System of America.
Can anyone give me an idea what is the value of these.It is quite an interesting story about this company . You could say a David and Goliath story, only this time its the Goliath that won. Is there a value on these stamps. Any information would be truly appreciated , thanks.

I can't help with the value of them, as I'm not sure if they are contained in any catalog of "cinderella" issues or not. In any case, these previous links may be of interest on the subject:

https://goscf.com/t/14612

https://goscf.com/t/21640

One further note: I checked ebay and "sold" listings for a set of six different IPSA stamps have been made at $6, suggesting the individual stamps may be worth up to $1 apiece. Of course, without a "catalog value" listed, the true value is what a buyer and seller can agree upon.