XF 1.5 Custom Themes?

Can someone point me in the best direction for someone who designs custom themes?
I have a forum in mind, but I really don't want to go asking questions without a ballpark price in mind already..
I don't have unlimited income and people will usually try to get the most $ they can if you don't know what custom themes go for.
That being said, I know you get what you pay for too..
Any advice?