I was at the site, and ordered a WM sleeping bag using the "rebatenow" code and the website removed 16% of the price.
However, on other web pages, it features the 16% discount, but excludes Western Mountaineering products.
If a few hours, when they open up in California, I'll find out how the discount is actually treated.
I couldn't get it to accept both the "shipfree" and "rebatenow" promotional codes. There is, evidently, a different free shipping for WM bags located on the promotions page, but I didn't find that till after I had completed the ordering process.