Diane, USAF? Italy huh? USN here in San Diego, I grew up with my dad in the USAF (28 years). We have 27 years in right now and still counting! Anyway, about your question, since you're in Italy it'll be mail order. I get all my supplies locally from cake decorating store, my sister in Bremerton WA also orders from my same source even though there are local suppliers for her there ... www.doitwithicing.com
You could also to a google search for cake decorating stores/suppliers. You may luck out and find a supplier in Europe (Par vae' is what they call it in France I think). You'll find that using this high-ratio shortening will give you more volume in frosting and it just tastes better, It is but far a superiour product of crisco!
Also, there is another topic running right now in this forum concerning shortenings in frosting. Some of the members have other web sites and manufactuers info on Sweetex and other simular products. Check out these posts some good info and testimonials.