I think the comma in the first sentence after although is incorrect. I would write "They still bought it, although it was expensive."
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What makes you think it's wrong?
Well, I would not use it, because although is introcuding a subordinate clause and you don't make a pause after although.
Sorry- I missed the comma in the part you quoted. I get your point and agree with you. Sorry for being a bit slow on the uptake. ;--)
although