Currently, Canon EOS R5 is out of stock everywhere, B&H expects next major EOS R5 shipment is in late October.
Adorama Camera currently has EOS R5 w/ RF 24-105mm f/4L IS USM Lens kit shipping within a few days, this should be the fastest way to get EOS R5 online.
Canon EOS R5 w/ RF 24-105mm f/4L IS USM Lens Kit – $4,999.00 – “Coming Soon” (This Item is on the way to our warehouse and is expected in a few days.) – at Adorama