Price Check: Fallout New Vegas promo postcard

[Ayatane]

Hello,

any Fallout collector or E3/PAX attendee can estimate the price or rarity of these postcards:




Wiki says they were handed out at special events (E3/PAX) and I couldn't find any listing or past listing of this item on ebay.

I'd like to add them to my collection, but I'm unsure of the rarity/value.

Thank you!