2008 Nissan Altima - Good deal?

You didn’t say what trim level, transmission, sedan or coupe, or provide any options. I assumed a 4 door sedan with CVT in SE trim, and in clean condition. It’s worth about $2000 according the the Edmunds True Market Value tool. As for how long it lasts, that depends on how many miles you drive per year and the current condition. Things start going wrong at the mileage, and you should consider them maintenance, not repairs. I’m thinking about brake calipers, rammer hoses, belts, and bushings at least. Get it checked by a mechanic you trust for about $125 if you really are interested. I would look at something with around 100,000 to 125,000 miles in your price range. Expect a compact car for $3000.