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This projector is worth about $150.00. A replacement lamp is almost $500.00, so it won't be worth it to relamp this model.
2500
1000.00
Old projector slides are typically only worth the sentimental value they bring to the owner. If a person doesn't have an old projector, the slides are worthless except as relics of bygone days.
50-100 or so
The value is what you can get for it, as with any used item.
50-100 USD
40-100 USD
$100
25-100 USD
50-100 USD or so
approximately 2 cents