Technically, the Libre is invasive as the measuring filament pierces the skin.
There are various manufacturers who claim to have a non-invasive one in the pipeline. Glucotrack seems to be selling one in Italy, but other than their website with it's shop there is little information. I haven't managed a reply from the owning company yet.
I e-mailed them a week ago asking about plans to appoint a UK supplier but haven't got a acknowledgement, let alone a reply yet.
I've detailed the info on pricing I found on the Italian site in this thread.
http://www.diabetes.co.uk/forum/threads/glucotrack-non-invasive-blood-glucose-monitor.73183/