If the Shopify experts want to charge you a lot of money, we recommend Elto.com. Projects start at $39 and they are usually awesome at getting projects done within a day or so. They have a 100% money back guarantee as well so you are certainly going to get what you pay for.
Oh, and for Shopify shops only, use coupon code SHPFY1 for 10% off all of your projects on Elto.com (formerly know as Tweaky.com).