There are solutions (chemical solutions,) that you can put stainless steel into which gives whatever stainless you place into it a almost charcoal black color
(there are actually several chemicals which will oxidize stainless , ranging from the common medicine cabinet staple Alka-Seltzer to more dramatic chemicals). It's all a question of what you want versus what you're willing to pay. If you have like this
result, then you can get off cheap at $20. If not, well, how much are you willing to pay
If you're looking for a way to do this at home yourself, this boob-tube
should be a good starting point.
Felt (after review,) that I should point out that the processes which I'm referring to is typically known as "bluing",(i.e. "oxidizing") and that there are a good many
processes to "blacken" stainless steel (far to many for me to know much about, some are fairly industry specific and only used in surgical implants, e.g., nitriding, carberizing, etc...), just depends on what you want.