Start saving for a birding trip to New Guinea as this will just about be the only place you are going to see these species these days.
And yes, I did see them in Europe. My uncle had them in the 60's when I was already infected with the bird virus. These birds made such in impression on me that I can still remember them clearly.
Here is a link where you can see some of the species in captivity.
http://awwp.alwabra.com/index.php/content/view/20/51/
Walsrode ( if you don't know what or where that is you are not really into birding) still has three species. Cicinnurus regius, Paradisaea raggianake, Paradisaea rubra, all three behind the screens and not accessable to Yo public. Unfortunately only hens from Chester after the cock birds died.
The Seleucidis melanoleuca are on display to the public and currently one young is beaing hand reared.
The reginus and the raggiana come in part from El-Wabra.
And the latest figures for 2012:
Birds of-paradise captive bred:
Importer/Re-Exporter
Paradisaea minor:
Denmark: number: 14
Japan: number: 20
Paradisaea rubro:
importer:
Croatie: number: 1
In total we are talking about approx 100 captive bred birds of paradise.
Cheers, Case, Tauranga, New Zealand.