Peter,
What all do you need? Do you need someone to design and code you a new theme or do you already have a website layout you need copied over? What you need will determine the price of the polished theme. Also the complexity of the style you want will also determine the finished price. For instance if you want the entire layout code rewritten, a designer would charge more for that than simply changing the colors and header of your community forum. Now, I have been designing styles since early 2006 and I have done more than a few each year since then. I am well versed in CSS and I used to run a skinning company called CompleteGFX (until all my works became pirated) where I sold over 14 custom made styles.
If you seriously in need of a new styles and have a low budget I can help you. Starting at $100 USD I can design you a custom header, footer, post icons (new post, old posts, link, locked forum), and a restyled "thread display" format. I am confident that I can deliver you a custom theme that exceeds your expectations and the quality of most free and paid styles offered on this forum. If you need a custom logo, I charge $55 USD for those aswell. The turn around time for a custom theme is approximately 5 working days or less. If you require more complex layout changes those can be acquired at a flat rate of $10 per major template edit (ie, custom nav bar, custom forum listing).
Please visit
http://completegfx.deviantart.com/gallery/ for a short list of some of the custom graphics and layouts I have made. For a list of XenForo related products and customer websites, I can send these via PC/PM only.
Also with purchase of a custom style, I can give you FULLY layered PSD files for all the custom art created for your project.
Remember if you purchase a custom theme, XenForo may require you to update your XF theme code. I also will be able to offer you this service at a $15 USD upgrade rate. However, if the update is simple and doesn't require major code edits, I will do those for free.
If your interested I have allowed some clients to peer onto my desktop while I create themes. If you are interested, I can also let you watch me design the style and code it absolutely free. If you have any questions or concerns please let me know.
Cheers,
Andrew B.