My fellow vinylists and collectors ... Mahler records are out there. I just received this Third Symphony sealed (!) - a 2 LP album, $20usd (Discogs).
All you need to do is keep an eye out.
Mahler 3 Haitink Philips SAL 3593 94
Bernard Haitink recorded the 3rd several times (5?) - he is a true master with this work. The above is his first. Highly recommended!