This is the tricky part. Most of these "vintage classics" exist only as 240p YouTube uploads or scratched DVDs sold at second-hand stalls in Chalai Market (Thiruvananthapuram).
For a true collector, the joy is finding a rare, uncut VHS rip of Swarna Medu where the night scene actually lasts 7 minutes instead of the censored 90 seconds. malayalam blue film shakeela