Approach your local fish shop and check with them on this. They probably might have some in stock, so it depends on your preference of brands or budget. If the tank is small, I really don't think you would need a fan unless you have direct sunlight on the tank or a heater near it. Place it in a corner of the room where there's no natural or synthetic heat (appliances, etc). Having a fan would increase evaporation rate and you would have to top up your water frequently, which will mess up your water parameters.
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