Click Here to Watch the Video. Film Source International offers a slitter/rewinder service to help customers in emergencies and to provide cost-effective solutions for custom film widths. Running low on film? No problem! Need a cheaper source for your narrow film? No problem! Lead times from major film providers can run from 4 to 5 weeks. Film Source can provide in-stock film gauges in one week, and expedited overnight shipping is available for emergencies.