There's lots of ways to save money. I'll buy store brand of most things, but I don't buy the cheapo toilet paper. There's not enough savings and I'd rather have the comfort. I had to put up with the sandpaper-rough and see-through thin 1-ply TP for too many years at work, school, and my parents' house growing up.
That being said, if I really wanted to save money I'd probably buy a bidet. Higher upfront cost, but over time it would save a lot.