BuyDig has a bundle of the Alpha a7R III, the recently released Tamron 28-75mm f/2.8 Di III RXD for Sony E, and a 64GB Extreme UHS-I U3 SDXC 90MB/s for only $3549.00. The regular price of the items in the bundle is about $3840, so this bundle is a $290 savings over purchasing everything separately.
Click here to check out the deal at BuyDig. BuyDig is both an authorized Sony and Tamron dealer, so all of these items come with manufacturer USA warranty.