Kyrill,
HD Tracks offers a fairly large catalog of independent labels. All of the music can be downloaded in either AIFF, FLAC or 320 MP3. This site is run by the Chesky brothers. They do take care of the music.
Unfortunately for you, the downloads, at this time, are only for US residents.
Music Giants offers music for download but you have to use IE.
archive.org offers LIVE music downloads in flac from many artists.
EBU European Broadcasting Union is offering files in flac
flac music links is a collection of links from the flac site of artists and label who sell downloads in flac.
As for your vinyl, I wouldn't really trust anyone with my collection. While it would be nice to have some of my vinyl moved to flac the logistics of shipping records about is more than I am willing to deal with. It is entirely legal for you to make "back-ups of your own music.
I will also suggest you obtain a
Hagerman Ripper and make your own files from your vinyl. In the long run it will probably be cheaper and better sounding than paying shipping charges and fees to have someone else transfer your vinyl.