I have them ALL. So they are out there And i am not an intentional collector.
they are out there, swapping and asking people that you know that work in shops etc to keep them for you is the way to go. i got 3 Olympic coins that way the other day.
I have a peter rabbit one will sale at the right price email me firstname.lastname@example.org
Have not seen any of the oins from 2015 or 2016nyet :(
I am a big collector but since 2014 I have not found 1 single commemorative coin in my change and it is the same for all the other collectors I know in the Reading Area. Basically big disappointment from this area as don't feel we will ever see these coins in our change.
I have already found peter rabbit from the Beatrix potter coins so they are out there :)
you can buy them from the royal mint website
Would love to find at least one of each design, but I guess that some might be very hard to get - unless you buy via eBay at very much inflated prices.