@misjoggi The error is actually on GMG's side. We use a so called "froduct feed" that lists all offers in a store. GMG's feed incorrectly displays products availability. In their feed GMG claims that Castlevania Triple Pack is in stock...
We've reached out to the them to notify them about this error and we hope for a quick fix.
EDIT: and yes, you're right. There should be an option to report incorrect pricing/other errors. It's on our to-do list. In the meantime, you can drop us an email through the contact form or let us know about the error in our forums (like you did just now).