Found a cheaper option here:
2008-2016 Lexus / Smart Card Key / PN: 89904-50642 / HYQ14ABB (OEM Ref
RSK-LEX-ABB0 Original OEM Condition: Refurbished FCC ID: HYQ14ABB IC: 1551A-14ABB Frequency: 315 Mhz Battery: CR2412 Buttons: None Emergency Key Included Test Key: LXP90 PN: 89904-50642, 89904-50480 Compatible with the following: 2008 - 2011 Lexus GS350 2008 - 2011 Lexus GS460 2008 - 2010 Lexus...
www.uhs-hardware.com