Shopify Experts vary in price, depending on what needs doing.
If you require custom solutions like: custom Shopify apps, custom Shopify themes, or custom Shopify development at all, you can expect to pay a bit more as the Shopify expert is doing some of the most complicated things within the Shopify platform.
However, if you simply want a pre-built theme from the Shopify theme store, and a few edits made, then this can cost anywhere between $1,000 to $10,000 depending on the scope of work.