I'm looking for recommendation on shops / people who can do cleaning on 4 Nikon lenses for a reasonable price. The quote I got so far asks for $80 per lens. That's a bit too much for 4 lenses.
Professional service has its value and price.
There are many factors that influence the efforts (= costs) to clean lenses. Without knowing the details (lenses, amount and type of work required) it is hard to comment on the quote.
You can approach bro fatigue (David) here and get his opinion.