Actually, I found that the $5K quoted by a local shop was for an old used engine. It is not refurbished and would need thorough inspection. I was also quoted $8K for a refurbished Jasper engine (www.jasperengines.com) installed. The Jasper engine route has been highly recommended since they guarantee it for 3 years 100K miles. Also, they will cover full warranty if the engine is installed by one of their recommended local workshops.
Lexus Corporate has agreed to pay me 50% of whatever it costs me to replace the engine (old, new or refurbished). That is the max they will do.