As you may know, PBS is not a producer but rather a distributor of programming. Our distribution rights are fairly limited and are often confined to only broadcasting. Unfortunately, we do not have streaming rights for The Collection. The Collection is a property of Amazon, and can be viewed through Amazon Prime.
If you have a TV, you may wish to check your local station's listings or contact your local station to see if they will be re-broadcasting The Collection. You can check the local schedule online here: http://www.pbs.org/tvschedules/index.html
And find contact information for your local station here: http://www.pbs.org/about/faq/station-finder/