[Thanks to Oga Shi for the tip]
One cool thing I miss about arcades is that they use to produce a poster for every game that the operator could put up as advertising for that title at their location. While some games today do occasionally come with a poster (mostly ones from Japan or Taiwan – I got one with Oriental Legend 2 and I was told that the BlazBlue kit comes with a bunch of promotional materials), many just have a flyer and not much else. Some old posters have become collectors items, like the nude Centipede poster by Atari or as is the case with this Gradius poster in Japan, which went for approximately $1445 USD or 138,000¥ in Japan. Rarity, condition, the quality of the artwork and the game that the poster belonged to is always a factor with these things but if I ever happen to come across for one of these Gradius posters for cheap then at least I know where to sell one now.