I'm not sure if this was mentioned earlier, but: nice bed sheets.
I prefer a crisp percale or sateen weave (depends on the manufacturer) with long-staple cotton like supima, around 500 thread count (more is not necessarily better). I've been able to find a nice set of sheets like this for around $50 on Amazon.
And then there's the fit. Fitted sheets that are too small are irritating to put on the bed. And too large looks and feels sloppy. There's nothing like a really nice fitted sheet that fits the mattress perfectly.
If it's winter where you are, get yourself some flannel sheets. I just had to buy a new set and they were like $35 off Amazon. Sooooo soft and it's lovely not sliding into cold sheets in the winter.
Love, love, love flannel sheets in cold weather. My husband claims they are scratchy, but I find them soft - just not as *smooth* obviously, because there is texture there.
My cheap thing is the high after a tough workout. I used to hate working out so much, even though I felt pretty good afterwards. It was like classical conditioning didn't work on me or something - I kept overeating till I was painfully full, but didn't do things that made me feel good? It took a while, but I finally do things that make me feel good and I very rarely eat so much that I am in pain. I am grateful for this reversal of my poles because, apparently, I am now more aligned with what actually *is* good for me. Right now, I have that feeling like my lungs have been scrubbed out nice and deep and clean, because I worked them so hard.