I spent today scrambling to get the house more organized after getting an unexpected call from carpenters wanting to come and start Sheetrock, then installing new insulation to replace what the electricians ripped out yesterday, and also doing a lot of cleaning. I expect that saved us quite a bit. We also ran out of insulation, but had some odds and ends that had been in our garage for yrs. That worked to fill in. It was a little mousy but useable. I don't want to think what a roll of insulation would cost locally.
We also located, at literally the last minute before leaving today, the partial roll of heavy plastic the building inspector recommended putting over the insulation. That saved $30 vs buying a new roll. We rarely use it so we didn't need any more of it laying around we don't use.
Small savings here and there, better than nothing.