Our used CALB "golf cart" cells are doing a bit better than @BritManToo units, we can get about 8kWh in/out if I push them, but they are definitely well worn.
Used cells are always going to be a lottery, but new 100Ah (5kWh) packs imported from China are still north of 60k when all the extras are included.
EDIT Note that the pack linked to by @BritManToo is Li-ion not LiFePO4. I'm not sure a used Li-ion pack is something I would want in my home/garage due to the possibility of thermal runaway if one cell gets over-charged.