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We don't currently have Lexus vehicles but I've bought navigation updates for our Toyotas numerous time with a 15% discount coupon from the Costco Auto Program at a participating Toyota dealership. It should be the same if you have a Costco membership and Lexus dealership near you participates in the Costco Auto Program. If you can do that, it would at least reduce the cost down to $178.50 not including tax. The fall 2018 update should be PT219-GEN08-18. Here is a link to a video that shows how a 2015 GS350 owner updated his navigation system with a micro SD card:

Just got the car, haven't had it 12 yrs. Thanks for the info!