Most true "support" issues are free, but I don't do any scripting, or anything like that. I refer to my web design customers. Naturally, the ones who have the best packages get the most referrals.
Most of my customers are web designers (resellers) they are expected to provide first level support, then we support them.
We also provide "Branded" support if - for example they are out of town we will provide support for their customers at a fixed rate per hour.