Abt offers the Pioneer AppRadio 4 Smartphone Receiver, model no. SPH-DA120, for an in-cart price of $428.80. This $100 mail-in rebate drops the price to $328.80. With free shipping, that's $71 under our mention from January and the lowest total price we've seen. (It's also a current best by $111.) This receiver features voice recognition, Apple CarPlay, and compatibility with MirrorLink, Siri, and AppRadio. Rebate expires December 31.

Update: The price has increased to $429 before the above rebate, $329 after.