Prices tend to go up once the official release date is out.

Prices will fall on release day with the vast majority of people opening packs and listing their items undercutting one another. They never fall dramatically but after the first day prices have a steady rise till they reach a point and settle. For example I had early access on fifa16 and got Lewandwoski for around 40-50k, on game release he had risen to 120k but was selling for between 100-110k. Luckily for me that night he scored 5 in 9 minutes against Wolfsburg and rocketed to 250k. When the market settled I sold mine for 280k. Might be worth buying the inform since he will be out of packs on wednesday.