PS2 games

Hi there, I want to start collecting PS2 games that I had growing up. Is Cex the best place to buy them? They have all the games I want but I get turned off by the fact they charge you 3 euro delivery fee for every single item. I don’t mind paying delivery but it’s kinda stupid if you are buying 6 games for example for a combined 18 euro and then paying 18 euro for delivery. So any help is appreciated..