Used 24-105mm FE lenses are now more expensive than the original new price due to lack of availability

The 24-105mm is chronically out of Stock in US stores. That’s why you get used one for up to $236 more than the original price at Amazon US.

New lens preorders:
Tamron 28-75mm FE at BHphoto, Amazon, BuyDig, FocusCamera and Adorama. In Europe at Amazon DE and WexUK.
Tokina 20mm FE at BHphoto and Adorama.
Sigma 14mm f/1.8 for $1,599 at BHphoto and Adorama.
Sigma 20mm f/1.4 for $899 at BHphoto and Adorama.
Sigma 24mm f/1.4 for $849 at BHphoto and Adorama.
Sigma 35mm f/1.4 for $899 at BHphoto and Adorama.
Sigma 50mm f/1.4 for $949 at BHphoto and Adorama.
Sigma 70mm macro for $569 at Adorama.
Sigma 85mm f/1.4 for $1,199 at BHphoto and Adorama.
Sigma 135mm f/1.8 for $1,399 at BHphoto and Adorama.

Sony cashback:
Sony US launched their big rebates you can find listed on those pages at BHphoto, Buydig, Adorama, FocusCamera.
First time rebates:
$300 off on the Sony A9 at BHphoto, Adorama, Amazon, BestBuy. FocusCamera.
$100 off on the 18-135mm lens at BHphoto, Adorama, Amazon, FocusCamera and BestBuy.
Lowest price ever:
$300 off on the 24-70mm f/4.0 Zeiss lens at Amazon, Adorama, BHphoto.