Based on posts over the past year, many people have the impression SIG is not a healthy company. This may or may not be the case. They have a phone number and email address on their web site
http://www.sigmfg.com so it's easy to ask them if they have what you want. If yes, order directly from them. Shipping is 9.95 which is about what most places charge. If you spend $150, shipping is free.