The SPC880\900 is an old product now, you won't find new. It's big advantage was that it was capable of being modified for long exposure. The chips and board were relatively easy to get at. I've got one floating around downstairs unmodified. It was not a great guide camera as has been said, noisy, but software was available that could give some degree of control. Hence it's popularity.
Prostar has been mentioned in another thread as both a reasonably cheap guide camera but also an entry level imaging camera. Might be worth looking into.
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