Orpheus Music
https://orpheusmusic.com.au
For all needs associated with recorders and recorder music and books
Dolmetch
http://www.dolmetsch.com/sheetmusic.htm
This site has a mixture of free and pay for music
Recorder Mail
http://recordermail.co.uk
Like Orpheus Music has a huge range of recorder music to buy.
imslp
http://imslp.org/wiki/category
One of the first large music sharing sites
Musescore
https://musescore.com/
A notation website that also provides some free shuetmusic for download.
8Notes
https://www.8notes.com
Another mixture of free and pay for . A lot of the music is free to view, but for all access, you need to subscribe. US$20 per year to subscribe and that lets you print full scores and parts to download.
Compmanion Tracks
http://www.compmaniontracks.com.au/quartets.html
This site provides “play along” tracks for a few items, where you can download a free score, but pay for the mp3 tracks, so that you can play along.
peninsularecorderensemble.com 