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The N64 fans are younger, don't have such high earnings, therefore the N64 2nd hand market is a little depressed at the moment, but should pick up in 3 or 4 years time as the sentimental value and buyers' incomes increase.
Also, cheap N64 games are normally either crap or so good that most people already have them.
That's why they're not such hot sellers at higher prices.
If you go into Prime though, check the topic about buying a Snes. Someone found one at an auction site for £3:50 with 6 games...