The higher end model is $119 (today/tomorrow/maybe next day), and that includes the faceplate for my car and the wiring harness.
Another $70 to plug it into my steering wheel controls.
So I'll look local, see if I can get a close match on price, and match in 4 speakers.
Or maybe I'll get adventuresome and do it myself (shudder, imagining myself frying the security system and bricking my car).