So now I have a dilemma. The textbook companies send us professors (unsolicited) copies of textbooks to try to get us to adopt them for our classes. I am drowning in textbooks, especially the gigantous basic-biology texts.
There's a person who buys textbooks for resale. I never sold anything to him before, feeling that it was vaguely unethical and that it probably drove up textbook prices for the students (I mean, you could think of it as a scam - prof gets books, prof sells books, prof has nice little side-income there). But, like I said, these are unsolicited (even to the point of my telling the company rep "No, I have no say in choosing the Gen Bio texts, don't send me any). So I sold one to the buyer today.

And I made $35.

So what do I do? Do I count it as "found money" and blow it on something fun (or something like more topsoil for my garden - $35 will buy a lot of good soil), or do I use it to be dutiful and pay down my big bill at the allergists' (which I think I wrote about a week ago - this is a $500 or so (now; I've paid some of it) bill that accrued thanks to bad accounting practice on the part of the record-keeper there). I've been paying $50 or so as I can; should I just go down there and do an $85 check next time?