At YOOX. My favorite is the black faux patent leather belt with metal chain detailing (pictured right). I think the belt would dress up a casual dress or a pair of jeans very nicely. Originally $182, it is on sale for $109. It is available in sizes 32 and 34. Available here.
For something a bit more conservative, yet still stylish, I like this velvet belt with matching metal buckle (pictured left in the black). The belt comes in black and a lighter brown and has a corduroy texture to it that is clearer in the picture of the brown belt. Originally $174, it is on sale for $104. The black belt is available in sizes 28, 30, and 32; the brown is available in sizes 28, 30, 32, and 36.
There is also this shiny grey faux patent leather belt (originally $174, now $104; available in size 28) and this slightly wider and slightly lighter shiny grey faux patent leather belt (originally $188, now $99; available in size 28). And, finally, this very narrow (.6") matte-finished belt available in red (sized 28, 30, and 32) and ivory (sizes 28 and 30) (originally $170, now $85).