Flying head test: is it an option?

Hi, searching the FAQs it seems flying head test is not included or a standard option but is it a possibility? It appears there are multiple board vendors; would I be better off contacting them vs going through DK? Is this intended to just be a quick turn prototype service where our board is panelized with others to fill a panel? We have a roughly 8 x 10 inch 2-layer board already in production but are wondering if we might do any better here. We typically order 100-250 at a time. Thank you!