find a popular player that cheapest buy now is around 1800. then go and make bids of around 1300 on that player and then put the ones you win up at a price they will sell.
Search for bronze auctions max price 200. Keep going through until you find any players with 85+ pace and bid on them. Just keep going til you get to the hour mark then go to your watch list and put all the ones you won up for 300+ buy now depending on how good they are. 90+ pace cards will get up to 2k sometimes. You can also do this method with silvers and golds but more people are likely to see them so it doesnt work as well. But you can get some decent deals on silvers. If you keep doing this and bidding 150/200/250 in bulk you can make hefty profits.