Here's a tip from me to you. The holidays are right around the corner. Customers who ask for quote should NOT be given a blanket date to select any day they wish -- including smack in the middle of Christmas/New Years vacation -- UNLESS they agree to premium pricing.
If you're providing customers with options for pricing (and you should) the DATE the project occurs should be a factor for pricing.
Holidays. Peak times. All of these are peak pricing.
There's a reason that pricing changes during certain times at hotels, airlines, trains, gas stations, fuel oil companies, grocery stores, etc...
I know for me all sorts of crazy stuff happens during the holidays - client emergencies, installs, projects.
This should all be priced higher for customers who demand/request this timeframe.
One customer who just emailed indicated that ""they are slow during Christmas"" can we do the upgrade then.
This is pretty similar to me calling American Airlines and expecting that I'd get the same price no matter when I wanted to fly. Just doesn't happen.
Watch for this as we approach the end of the year which for many of us can be a peak time.