Don't forget, if you appear too cheap, people will walk away as well.
The premise of a basic site for £xx. then £yy for each hours update that philthy suggests is a good one especially as a starting point, and it sets expectations early on.
You could also produce a set of templates from what you've already done, that a client could have customised at xx/hour as well if that suits you better.
Just don't undersell yourself!