I'm creating a website and i want to register lukearts.net it's availible but i dont know where to get it cheap!
I also have a host and 7 servers from my dads website!
My cheapest domain registrar is yahoo! for $9.95 a year but i dont know if that's cheap or expensive?

www.voxdomains.com (http://www.voxdomains.com) 8.75 a year... i don't know if there is cheaper but it is at least cheaper than what you said!

Domain names are around the same price everywhere...under $8 and id suspect it was dodgy, over $10 and its a rip-off!
Mines from namecheap.com ($8.88) and lots of people use godaddy.com ($8.95)

www.lvcs.net
I've used them for about 3 years now, I used to use them for hosting, but I moved to contigadigital.com , for their uptime. Anyways, it's either 7 or 8 dollars for a .com domain there.