Any good artist that can draw for me?

He did a comic for that

That is why you contact someone you know does commissions and chat to them. You describe what you want, they tell you what they will charge, you decide if you care enough to pay that.

That all depends on what exactly you want, and at what quality. The popular free art indexes (such as DeviantArt) have many commission artists, and they typically display their prices up-front either on their page or in a seperate listing submission. They tell you how much something will cost, and what you'll be getting, and often with a sample of the type of result you'll be getting.

"Reasonable" all depends on your perception, really. The more you pay, the more quality you get (usually). Though there are plenty of unknown artists who undersell their services for various reasons, just as there are more popular artists that charge an insane amount for relatively little work in a manner akin to "paying for a brand name". Browse around, and look at their advertised prices. Also, before you buy, google their name and "buyer beware" to see if they have a history of poor behaviour. While you can get great quality art for next to nothing sometimes, non-career artists from the free art indexes are notorious for bad customer service, or outright taking your money, refusing to do the work for months, and then refusing a refund when they give you something you didn't want.

Always look at their terms of commissioning, and when approaching someone for art, don't be afraid to ask questions about the general process. Anyone who can't handle some honest, simple dialogue probably aren't worth trusting with a pay-up-front transaction (which is the norm). It's normal for an artist to show you a rough sketch so that you can request alterations and adjustments before they begin finalising the art, and then allow you to request minor alterations near to the piece being finished. Though, it varies between artists, so communication is vital.

Don't be afraid to look further afield, because sometimes the artists don't use things like DeviantArt, instead preferring a little home site. FurAffinity is similar, though the subject matter tends more towards furries, but a good number of them are happy to do non-furry stuff. Just make sure you check out their human artwork first. I can't say much for tumblr-oriented art, given I don't know jack shit about that clusterfuck of a hosting site. :V

ahh It's fun to do stuff like this comrade and as long as it's nothing which would take a real amount of time it's fine for me doing this for free.