Hi Jim,
I have used FastSigns in several locations (for full disclosure: not in Fort Myers) and have received excellent results. They make all kinds of commercial signs and banners. Like Lisa, I make my own design and either e-mail it to them or take it in on a flash drive. Let them know you want heavy commercial grade vinyl. On Wild Blue, I had them use a gold foil and solid dark blue with my files. On our current boat, red and white lettering in a wave pattern. Excellent results.
I made a file for some friends here for their boat, using their idea for what they wanted and matched the color to their fishing boat. They took the file to the closest FastSigns (about 45 miles away), and got a perfect match for the color on their boat.
Their prices are reasonable, you can work with them face-to-face if you want, and they had my graphics ready the next day. They threw in a spatula-type squeegee for the install - easy to do yourself since they have it all laid out, with the proper spacing... fit it in place, squeegee it down, peel off the installation sheet. I have them do my registration numbers, too, so the colors and fonts match.
Jim