Aim to sign your contract in the quiet weeks between Thanksgiving and New Year's Day. Fabricators are often looking to fill their January schedules and may be more willing to negotiate on labor costs.
This is generally the worst time to buy. Fabricators are often backlogged by weeks, and because demand is high, there is very little room for price negotiation. Strategic Tips for the Best Value
If you aren't picky about a specific brand-name quartz, look for "remnants" or "stock slabs" during slow months. Suppliers are more motivated to move these smaller or older pieces when floor space is needed for new spring shipments.