computer keyboards

hey guys you know a good site with a lot of keyboards i can buy from? im looking for keyboards that have a flat bottom
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----- do you know what im talking about? can you see from the picture, i want the bottom part of the keyboard to be straight and not curvy but the top can be whatever because at my desk i have this thing that blocks off and it would be hard to put a curvy bottomed keyboard. and i also would like one with volume control, also i dont want a keyboard with a arrow next to the right shift, if you know what i mean, so basically i want a regular straight bottomed keyboard with volume control