No personal experience with UCI direct.
Don't speak Italian either, but you can run any website through Google Translator or similar online translator.
The UCI website shown (above)
Ufficio Centrale Italiano/Polizze temporanee di frontiera
is (in translation) apparently only a UCI general administrative office/ website, listing only Italy office locations in major cities with address, tel, fax, but no email addresses. Website says to contact any of these local offices; displays no function to purchase Green Card thru this website.

Although Green Card prices may be more expensive through
Mototouring How does the European Green Card Insurance work?,
(or any of the other Euro Green Card specialty brokers in this thread),
the advantage is that you can apply/authorize purchase of the Green Card directly on their website(s), and even have the Green Card document mail delivered to you in advance of leaving for Europe.

If you're air or seafreighting a bike into Europe, you'll need the Green Card document in advance to present for Customs clearance. If your bike is already in Europe, you'll still likely save a hassle/ separate trip to buy the Green Card from a local broker office, if you obtain the Green Card in advance of travel.

It appears (to me) that, to take advantage of the lower prices quoted on the UCI website, you would have to physically present yourself to one of the Italy city office locations shown on the website--or speak Italian and call one of those offices. Even if you're willing/ able to do that, many local broker offices still require that you physically present your vehicle registration & personal ID to complete a Green Card purchase transaction onsite.

CourtFisher. Thank you. We had run the website through a translator, but that was not particularly enlightening. You are probably right that to take advantage of this price, one would need to physically be there. Thanks for the information.

I used to have the insurance through a German company, arranged by Stephan from Knopftours. However, as the previous posts mention their (insurance companies) rates went way up! I used to pay 66 Euros for 3 months, now the fees are around 70 Euro for a month.

I am currently a US citizen but I was born in Poland. Poland is now part of EU. I researched recently some alternatives to insuring my US registered bike in Germany and was able to find the following: I can buy a so called "border-insurance" in Poland for 170 Polish Zloty, which is about 42 Euros per month. This isurance is only a 3rd party liability (w/o option to add anything else). It covers me in all the EU countries. It can be purchased for multiples of the 30day period, but it has to be for minimum 30 days. I don't think one has to be Polish in order to obtain it.

That might be a useful option for some folks in some circumstances.
But...can you share more detail/ info on exactly where and how one might obtain this Polish-originating "border-insurance" (that means the same thing as Euro Green Card) coverage?
E.g., is there a website of an agency or broker in Poland where anyone can request/ order this coverage in advance of going to Europe for/ with a US-registered bike?
Or, must someone go physically to a particular agency location/ address in Poland to obtain this coverage?
If not a website, do you have name of agency, address, tel, fax in Poland; name of English-speaking staff person at this agency?
Thanks