This margarine is often sought-after by the GFCFSF community because it is soy-free and is only available during Passover. I tracked some down on www.kosher.com (for the specific page, click HERE).
I communicated via email with Joshua in the Customer Service department and received the following information:
"The Mothers margarine product on our site contains no milk products, no animal products and is soy free, corn free and milk free."According to Joshua at Kosher.com, the ingredients are: partially hydrogenated cottonseed oil, water, vegetable mono & diglycerides, potassium sorbate (a preservative), artificial flavor, citric acid, vitamin a palmitate added, annatto (color).
This margarine contains partially hydrogenated oil, which many people are avoiding these days. I have included links to Wikipedia articles on all of the ingredients above. Please check them out first before ordering so that you know what you're getting.
Discount & Shipping Info
Use the coupon code "Gettinglate08" during checkout and receive 5% off. This product also qualifies for their special Passover flat rate FedEx shipping cost of $14.99.
I also found some of the soy-free Mother's margarine at www.mykoshermarket.com (click HERE for the specific page). They actually have a better variety of the stuff (unsalted and salted; sticks and tubs), but I didn't not communicate with the company, so I'm not 100% sure that it is soy-free (although I'm guessing it is).
Another (Better?) Option
If you're not happy with some of the ingredients of the Mother's margarine, try coconut oil instead. This can be used in cooking and baking, and you can spread it on muffins and pancakes too. The "refined" version has no taste. The "unrefined" version has a coconut taste. I use both, depending on what I'm doing.