As a possible guide rather than a recommendation, I paid USD15 each for four 72-pin 128MB SIMMs just over two years ago. The idea was engaging enough that I thought the price to be reasonable. I haven't seen a similar offer since, albeit I haven't been looking, either. When daylight comes I may venture out to the garage and burrow around in my 72-pin box to rediscover the chip arrangement and chip manufacturer. (I'm not inclined to play gastroenterologist with the Q 605 at the moment.)

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