Custom maps for real estate applications (regardless of content and style) are always priced by quote as every project has different requirements.
As a guideline, most single images (for the web) are in the $40 - $50 range with a significant price break given for multiple images. Images created for print run higher. The final price is usually determined by your content and deadline requirements, with highly detailed images running much higher.
We accept all major credit cards, and that is our preferred method of arranging payment on all orders under $2000.
Note that no work is billed until you approve the final image(s). If needed, we will invoice recognized companies with a supplied purchase order. Electronic transfer of funds is agreeable.