The key is to remember what it is that you're selling. You're not just selling 2 weeks of your time at your best consulting rate. You're selling all the time

The key is to remember what it is that you're selling. You're not just selling 2 weeks of your time at your best consulting rate. You're selling all the time and effort it took to get the codebase into the polished shape it's in today. The best way to approach something like this is to figure out how much it would cost your suitor to hire a team and build your existing site from scratch. You should be able to figure out the actual level of effort to do so, since you've actually done it yourself. Figure out a number, and that's your price. It may sound extravagantly expensive, but really it's a great deal for him. The customer gets his website for the same as it would have cost him to build it himself, but with a working reference version he's guaranteed that it will work at least as well as the existing site, and he gets the benefit of delivery a full 6 months to a year ahead of what he would otherwise have. So there you are. $100,000 for the source license, plus 2 weeks of your time at the highest hourly rate that you can say with a straight face, plus a monthly maintenance retainer, plus several hundred per month for hosting. Good luck!