Changing to LED bulbs was one thing that noticeably cut down our electric usage. MrsPete buys them at Costco when they're on sale, although we've only had to replace one or two, the LED might last forever, but the cheap Chicom capacitors inside don't! I have a weird fascination with LED's, I have a pretty large collection of parts and I've made quite a few either 12v or 5v lights for inside the house. I wire up the 5v units with USB plugs so they can be run pretty much anywhere.
JM you are right, PA kero is really dirty and burns terribly, usually clogs the wick too. We get ours just over the state line, the proprietor there is really friendly with MrsPete, I'll have to have her stop in and see about this form thing, I know we didn't have anything like that last winter. Probably something cooked up by the Demon Queen of Albany. I have had good luck when I've been forced to burn the local stuff by adding 8 oz of Mineral Spirits to a 5 gal jug, helps it to burn a little hotter and cleaner.
Several years ago when I was building up my oil lamp collection, I bought 2 5-gallon jugs of liquid paraffin at my favorite store, the restaurant supply. I have $50 each as a price stuck in my head, and I thought that was outrageous at the time. One of my prized possessions is the trawler lamp I took out of my boat when I sold it. I just like the light it gives, and I certainly couldn't justify buying one now, the price is 5x what I paid back then.
Lately I've been buying odd trade goods (and ones I could use myself) such as saw blades, chain saw chain, knife sharpeners, leather gloves, fishing line, etc. I've been using only my overtime and holiday pay, so I don't really even notice it in the budget.
Other than supplies, I've planted a bunch of Jerusalem Artichokes, plain daylilies (the buds are better than green beans and they're perennial), and 65 pots of hazlenut seedlings. We just keep at it right up until the buzzer.