Hello Tapiola,
the BIS recordings are always(mostly) available as FLAC downloads for purchase from
http://www.eclassical.com/before the physical CD will be released. It is the download shop related to BIS in a similar way as
"The Classical Shop" for Chandos.
If you have got some advanced audio equipment, you can buy the files in 24 bit (HD) Studio Master quality,
giving you - like SACDs - even better sound than possible on conventional CDs. For some time (2-4 weeks)
from the start of these new releases, they offer the HD files for the same price (called 24 FLAC discount)
as those in standard CD quality.
The downloads for the new Aho disc can be found at
http://www.eclassical.com/labels/bis/aho-symphony-no15.html.