Reddit mentions of Avenir Thorn Resistant Tube 700x18-25c

I'm 175 and ride 85 psi in front and 120 in back (I should be going 130, but I don't like exceeding the max). You might try 120. This will mostly just prevent pinch flats (snakebites), so it might not help any.

Thicker 700c tubes. There's probably other/better brands out there, that was the first one I found with a quick search.

You'll want a normal tube as a spare, though. These things are huge!

Because they're heavy and thick, it's often better (though more expensive) to upgrade your tire (Gatorskins and Gatorskin Hardshell for example) instead, for better overall rolling resistance.