FYE is horrible, their shipping rates are horrible and any deal links I've ever found are DOA for their site. Although, I had the link(s) I used saying 'free shipping at such n such a level', but I think it only may apply to dvds/cds.
I desperately wanted 'Adventures Of Darwin', which is $19.49 at fye's site, but without free shipping, it goes up to almost $24-25 shipped. Horrible. But, FYE.com still has PS1 games in stock, most of which are sports, with a few exceptions.
I mixed one used PS1 title and one new PS2 game, but it was still no go.
Oh and if you're looking for a decent site, there's also Wherehouse.com, which is another side site of FYE. They list the number of copies of each used game left, so you don't get 'out of stock'. There's many cheap PS1/PS2/XBox games there too, mainly sports, but some other titles that're decent.
Maybe I'll check into this still though....never know....
EDIT: Ok, that was worth a shot, but apparently 'free budget shipping' means they change the standard shipping charges name to 'budget shipping', but it stays the sames. And, I don't think codes stack, though that 'budget shipping shit is a scam, since it did the same even when I didn't have any other codes to use.