I get them at F&S too. I think a lot of online sellers don't offer them, because they require such a huge amount of packing material for such an inexpensive item. F&S packs them in a huge box, bubble wrapped, and with an entire plant full of peanuts (the starch ones, which my cats and dog eat if I don't clean 'em up.)
Look at the "Twin Tube" lids-they have a wider panel at the back, so you can leave a light strip where it is to feed. I think the glass is thicker, too.
Remember that Darwin was mostly right!