I’ve changed out some PAR38 bulbs from incandescent to LED, and the savings have been unnoticeable. Running the air conditioner to battle a hot summer can mask any energy savings that LED bulbs present.
Costco is currently selling 20 watt (90 watt equivalent) PAR38 bulbs for $22.99. I think there was a instant rebate earlier, but I don’t have a reference photo. Two years ago, Costco was selling 18W (75 watt equivalent) PAR38 LEDs for $29.99, after rebate.
However, I did notice that the floor space devoted to CFLs have diminished. Even chandelier bulbs, which Costco previously sold in CFL format have changed over to LED.