Retro Game Collecting Isn't Necessarily Expensive

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Depends on what you consider Retro, but I just grabbed a bunch of 360 games for like $5-8 a pop, they're going dirt cheap right now and they're old enough to be yesterday's news but not yet old enough to be appealing to retro enthusiasts.

That's the sweet spot; around 2 gens later, after 3 they tend to become collector's items, while last gen isn't really "retro" yet.