All camera manufacturers use a proprietary lens mount and there is no compatibility between different brands. So don't buy a Nikon lens for your Sony DSLR. Instead, if you're looking for a reasonably priced lens for your A200 look for Minolta Maxxum AF lenses on eBay.
Your A200 uses the Minolta Maxxum "A" lens mount introduced on the Minolta Maxxum AF 7000 35mm film camera in 1985. The "A" mount was used on the later Konica-Minolta 5D and 7D DSLR cameras and when Sony bought the DSLR technology and manufacturing in 2006 Sony kept that lens mount. One of the best zoom lenses Minolta made for the Maxxum cameras was the 70-210mm f4 zoom known as the "Beercan".
I've seen this lens listed on Ebay by reputable sellers for $200.00 and less. You can buy a Minolta Maxxum AF 50mm f1.4 prime at B&H for about $224.00. The Sony-branded version is about $370.00 - and its the same lens.
http://www.bhphotovideo.com So if you're bargain-hunting for lenses for your A200 look no further than the legacy Minolta Maxxum AF lenses. "Lens" is singular. "Lenses" is plural.
Each system camera will have an associated lens mount, any lens of that lens mount will work, with a few exceptions. Additionally it is sometimes possible to adapt lenses from other mounts, with a few complication. Your Sony a200 uses the same lens mount as Minolta AF (Maxxum/Dynax/Alpha) cameras, most of these Minolta lenses will fit straight on and work fully, with a few exceptions.
Additionally, M42 screw mount lenses can be adapted and function as manual only lenses. Nikon lenses won't adapt properly, neither will any other lenses. I shan't elaborate further as this is all the info you need.
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