There's no such thing.
There is no market value for the 1974 aluminum cent because it's illegal to own one.
Because the legality of the coins is in doubt and currently are illegal to have, a value can't be given.
1943 cents were minted from zinc coated steel, not aluminum. If they were aluminum they'd be so light they could blow away from your hand in a slight breeze. For prices, see the following link
More information is needed, please be more specific and post new question.
Most likely you have seen a fake. Someone probably electroplated an ordinary 1976 d penny with silver or aluminum. Check its weight. Aluminum is light, less than 1/3rd the density of copper. Compare its weight with a copper penny. If the "aluminum" penny is just as heavy, then it is a electroplated penny. If it is light, then it is a complete fake.
1041
It sounds like you're referring to the 1943 wheat penny, which is actually made of zinc-coated steel, not silver or aluminum. In circulated condition, one is worth about 10 cents.
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