Ok I went ahead and ordered some new juice from Blue Mist Vaping, as someone suggested on this thread, and I've got to say it's pretty darned good stuff! I got maple bacon, sex on the beach, and they sent along a little bottle of buttery nipple and it's all really good. I've been switching back and forth between the three of them all day.
Also, yeah, I'm going to have to agree with the people who said it was probably the TV juice that was killing my cartos, because I've been vaping the BMV stuff pretty much non-stop since it arrived yesterday, and my carts are still going strong. My cartos would have already started tasting like crap and getting clogged up by now if I was vaping the TV stuff. It's a shame, because their juice is really awesome, but I just can't afford to go through a carto a day.
I'm really glad someone recommended BMV. Seems now I can have tasty juice (at a ridiculously low price) without killing my cartos! Win!