I’m spring cleaning and came accross this old Pokemon HeartGold/SoulSilver Promo Poster…

So I used to be a manager at Toys 'R' Us and am a big handheld fan, so I took the promo poster home after the event. It's cardstock, double-sided, and pretty big. Can't find another one like it anywhere. Anyone have any idea what something like this may be worth? TIA!

Promo poster:

^{And no it's not about tree fiddy…}