As title, had my spark plugs changed when I got the car serviced during the week. I normally just go to the Lexus dealer, but I think I'm done with paying those kind of prices now that the car is nearly 10 years-old. Instead, I sourced all the parts myself (genuine Lexus) and got a recently-discovered local independent to do the work.
When I picked the car up, I chatted with the mechanic for a bit and it was obvious he was extremely knowledgeable about our cars and I asked him about the old plugs that came out. He was of the opinion that they were fine and would easily do 100K miles.
I don't know what a "good" plug is supposed to look like, but here's a pic of them after doing 64.5K.