Supernatural HD screencaps

wikipedia 

BEST SOURCE:

1.http://www.homeofthenutty

2.http://community.livejournal.com/toxic_caps
3.http://black-celebration.net/ 
4.http://community.livejournal.com/ginevra_caps

HQ screencaps, link and samples:

1.http://www.homeofthenutty

Size 1280x720

Season One (1,5/22)
Season Two (1,2,4,7,11,12,15-20/22)
Season Three (2-16/16)
Season Four (1-11,13,15-20/22)
Season Five (22/22)
Season Six (22/22)

SAMPLES

2.http://community.livejournal.com/toxic_caps

Size 1280x720

Season Four (16/22)
Season Five (22/22) 
Season Six (20/22)

SAMPLES 

3.http://black-celebration.net/

Size 1156x642

Season One (22/22)

Season Two (22/22)

SAMPLES

4.http://community.livejournal.com/ginevra_caps

 Size 1024x576

Season Five (6/22)

SAMPLE