Lots of different "Renewed" or "Refurbished" options for cameras on the official Reolink eBay page. Minor extra discounts available if you're buying 2 or 4 of the RLC-510A (white), the RLC-511, the RLC-810A, or RLC-820A. Main link to the 820A listing.
I got myself two more of the 820A refurbs. Seems very cheap for more 4K PoE cameras. Have bought an RLC-510A refurb before - it arrived in a plain brown box (and I think the firmware was an older copy when I was going around updating them all?) but otherwise perfect condition, so I'm happy with the savings.
RLC-820A (dome style, 8MP, $62.39): https://www.ebay.com.au/itm/394479721532
RLC-810A (bullet style, 8MP, $62.39): https://www.ebay.com.au/itm/395080989500
RLC-511 (bullet style, optical zoom, 5MP, $62.39): https://www.ebay.com.au/itm/395056273528
RLC-510A white (bullet style, 5MP, $47.19): https://www.ebay.com.au/itm/395067306881
RLC-510A black (bullet style, 5MP, $47.19): https://www.ebay.com.au/itm/394940957874
mmm 4mm fixed, no thanks
if you want proper coverage you need 2.8mm