Hi all, apologies if this is in the wrong place but I’m new here and not a clue what I’m doing 
My father in law has asked a favour from me knowing I’m an Indigo League girlie. However, I am way out of the game and haven’t collected in a long time. My speciality these days is Lego 
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He used to sell them in his shop back in the day and was clearing his storage yard and found boxes of sealed Wizards of the Coast era (1999/2000) binders (images below).
I was hoping you lovely knowledgeable bunch could help me regarding where would be best to sell these and at what price points? I’ve done some research but honestly, there’s not much out there regarding this specific binder that I can see, and what is there is used and pretty knackered binders (understandable after 20 years). Other than ebay, I wouldn’t know where else to sell them (or if there is even anywhere else). I wouldn’t want to sell them on Vinted as I don’t have the best experience from there.
I know how salesy this looks (I did read the rules)
but I promise that isn’t my angle 
I wanna help him and win some daughter in law points but I don’t wanna set a price point too high/low.
Any price recommendations, further info etc would all be massively appreciated!
really appreciated!