Recently sold my 2005 Prius (with JBL sound system). I took my aftermarket parts out because I pretty much sold the car for parts. I have a PAC RP4.2-TY11 adapter connected to a Pioneer DEH-X3910BT. I had it professionally installed a few years ago. I don't have any use for the PAC anymore since I bought a Mazda 5 so I'm looking to sell it. I'm willing to sell the Pioneer as well, but if you don't want it, I'll use it in my current car. It cost me $130 a few years ago but sells for $90 new now on Amazon. The connectors are all wired up and ready to plug right into the car and stereo. With the Pioneer I could install both in less than 5 minutes. Not sure what it's worth but shoot me an offer. Nonsmoker, pretty anal about my car so it's very clean. Located in North Georgia/Atlanta, local sale will get a better deal. Pioneer stereo has bluetooth, hands free calling, aux, CD changer, lots of features for a single din stereo. Fits in the "pocket" underneath the stock stereo so it is invisible to thieves. Picture below is not mine but shows the stealth install. Note this was used for a JBL system in an 05, I don't know if it's compatible with an 08+ Prius or with a 2005 non-JBL system.
Yeah, had no need for the stock stereo. I plugged the stock stereo back in when I sold the car and it still worked 100%.