So I want to change the handlebars on my 2014 xl883n iron. 

I am interested in this Zodiac Tomahawk 12" look

https://www.google.com/search?q=zodiac+tomahawk&client=ms-android-telstra-au&prmd=isnv&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiro7juxrPkAhUm8XMBHauFBF4Q_AUoAXoECA0QAQ&biw=360&bih=612#imgrc=SQZbAl_vKx5n9M

 and I would like to know what cables I need to buy. The dealer quoted me $800 for the cables, but after having a look online I saw some cables for $50-200.

Which ones are the proper cables that I need?

Doesn't $800 just for the cables sound too much?

So by cables I presume your talking about Clutch, Brake and Throttle + Electrical, so the price from the dealer is their normal over the top 500% markup one.  I just did the same exercise and here are my findings:

-  Whats the 'new' height of the bars compared to the old?  ie exactly how much higher are they than the stock ones?  I went from stock to 12" on my 2009 Sporty and needed to extend the wiring, Throttle cables & Brake line, and while I did not do the clutch it could do with an extra 1" in length at some stage.  Some bars do not need all this as the new height delta is small enough to not be an issue.  I think I went with a 2" extension system (or was it 4"; I cannot remember)

-  I bought a $50 cable extension 'kit' on eBay for my model bike and then fitted it over the course of a half day.  Its actually really easy to do.  The kit i got was an 'extender' kit so you remove the pins from the connectors under the tank and then install the extension cables and heatshrink over the joiner.  Works well and if you take your time and draw picture first then easy as.

- I also used the opportunity to run ALL the electrical cables internally within the handlebar for a WAY cleaner look.  The issue with taller bars is that the clutter of external run cables starts to mess up the aesthetic so going internal is the answer.  Are you planning this?  If so then ask about the bars your buying and make sure they support internal cables.  As you new ones are welded at the riser to handgrip area I am suspicious that there is no hole there to run the cables down the tube. {forget this as I just read that they support internal wires}

-  Ditch the stock brake line and get a good flexible one that you can conform to the bar shape.

I will find out the difference of the heigh between the handlebars and come back to post.

I want to buy the cables if there is a big difference of heigh, for their normal price without the dealer ripping me off, so Ill need some help in finding the correct ones.

To be fair to the dealers, job can take a few hours - hence the higher quote, so best to do it yourself.

There are plenty of good independent workshops around that will do a better job cheaper.

The bike is under warranty so Im not sure if I can get somebody else to run the cables through.

What is your experience in this matter? (Question to all)

I can't see how that will void your warranty. (But hey its the Moco I wouldn't be surprised if they tried it on)

Ill update once I get the job done