It's pretty easy and quick to get something that looks commercial quality with RoR and for that reason there's a lot of people out there offering to build your software for £100. Beware though, just because something looks right, doesn't mean it is, poorly written code could destroy your business before it even starts. Are you using a programmer you know or one of these sites where you post your requirements and lots of Asian and Eastern European 'coders' bid peanuts?