Yes, it s possible to find the book elsewhere. Even a bit cheaper.
But, to be sincere, and as a
strictly personal option, given the tiny difference of price I prefer my money to go to a fellow forumite. That's just me.
Besides, this encourages people to offer here books that may be difficult to find otherwise.
To each its own, of course, but that's. for example, how I got (dirt cheap, in perspective) my copy of Cato's book some years ago...