*Offer applies to purchases of 3 qualifying catalog products or more, of which every 4th product is free from eligible locations. Free product must be of equal or lesser value to the lowest priced purchased product. Eligible locations: Algeria, Argentina, Austria, Australia, Bahrain, Belgium, Brazil, Canada, Chile, Colombia, Costa Rica, Croatia, Czech Republic, Denmark, Egypt, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, India, Indonesia, Ireland, Israel, Italy, Jordan, Latvia, Lithuania, Luxembourg, Malaysia, Mexico, Morocco, Netherlands, New Zealand, Nigeria, Norway, Panama, Peru, Poland, Portugal, Qatar, Romania, Russian Federation, Saudi Arabia, Serbia, Singapore, Slovakia, Slovenia, Spain, South Africa, South Korea, Sweden, Switzerland, Thailand, Tunisia, Turkey, United Arab Emirates, United Kingdom, United States of America, Uruguay, Vietnam. Expires December 17, 2021. No cash or cash equivalent. No substitutions. Offer may not be applied to existing, pending, or prior orders. Promotion code GLFSBG21 must be referenced when placing an order. Sampler Kits, PTMScan® HS Kits, PTMScan® Services, any 'BSA and Azide Free' antibody, and Custom products or orders are excluded. Cannot be combined with any other promotions or discounts. Items that are not eligible, tax and shipping and handling charges will not be included in determining merchandise subtotal. Void if copied or transferred and where prohibited by law. Institutional discounts may still be applied to other items that are not eligible for this offer. CST retains the right to modify or stop the promotion at any given time without notice.