It is a little tricky to put a price on a card that only about 12000 exist of (a randomized guess, as I have only seen a couple in my life, and a guy with over 40,000 cards doesn't have one). I would at least put it for $100, but I see on ebay that people are selling them for $16-$30.
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You can find doduo either at the safari zone or you can find it at cycling road.
Train your Doduo to level 31 and it will evolve into a Dodrio. Just to help, if you go to Kanto, follow the path and after the last fisherman, keep going and you'll see grass, lvl. 30 Doduo are in there!, also in soulsliver and heartgold go to kanto near victory rd there is patches of grass you can also catch doduo there lvl 30
Doduo evolves into Dodrio at level 31. http://www.serebii.net/pokedex-rs/084.shtml
talk to dawns sister in sangem town,she might say there are doduo at route 201 dawn or lucasue which there one ( i have lucasue)
Go to the safari zone when you are able to customize the safari zone and go to the rocky beach and go through the grass until you have found a doduo bird. I hope I haved helped!