I used to use a Discman player and was really happy with it, even though I had to put in freshly recharged batts every morning. Worth it, and two pairs of batteries would go for about a year and a half, not the 1000 cycles they promised but waaaayy cheaper than a fistful of alkalines. So +1 on the rechargeables.
For an additional idea:
I use a timer on my water heater. It seems to have made a difference, not huge but noticeable. About 5-7.5% on the utility bill. Adding a blanket would improve that I'm sure, but there's not much room to spare in the closet where it lives.
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