Going through some photos, I happened across this one I took at a used game store somewhere in Osaka. It's a promotional flyer for Rockman 2, back before the game came out. Sadly it's not a real poster, but a print out from a scan or photo (but I might ask for a copy all the same should I ever go back).
The text reads "After one year" and then "That Super Robot returns at last, along with your characters chosen among the total 8,730 application postcards!" It's quite a bit of hype built up for the game (well deserved, too). You wouldn't suspect the stories that the original Rockman fell flat on its face when it first came out. The release date is just listed as latter December.
The price, you can see, is ¥5,800. Best as I can find, in 1988 it would have cost around $45 US, which doesn't seem like terribly much. Of course, as a kid, getting my folks to hand over 45 bucks would have been no simple feat!