Are the trades still in print? I did buy all of John's run when it originally came out in trade form (well up to New 52 at least) but those don't always get reprinted endlessly.

They're not in print, so I bought them off e-bay.

DC keeps all the Johns Green Lantern omnibuses in print.

Yeah, but since I already had the 4 trades it's kind of wasteful to buy the three omnibi when I've got the contents of the first one and a half already.

I placed the orders for the other trades that have the following issues. Stupid me, I didn't read the listing closely enough - they're hardcovers, but that's not a big deal. They have the same content and close to the same size.