Search for specific players with their lowest BIN value set (check futbin it’s usually accurate) until you only have a few appearing in the search result, then click on a card and back out into the list until a newly listed one appears (below current BIN). Was doing this with Luke Shaw for example who sells for 7400 atm and I got a few sniped for <7000.
This was my method all of last year and whilst boring it beats buying FP and some days 100k profit was easy, particularly during times when packs are being spammed as you get plenty of cards for way below their going rate if you’re quick enough. This method may not work if you have a poor connection or latency to the servers though.