Maverick, wifi are isn't very reliable do to possible interference from all these wifi gadgets now a days, They will fail right when you need them. 1 wifi camera might be ok, but the more you add the problems.
This looks like a good deal, but you will need to buy a hard drive. https://www.newegg.com/Product/Product.aspx?sdtid=12321619&SID=84fd9180038c11e99fd8dee7c78a78dc0INT&AID=10446076&PID=1225267&nm_mc=AFC-C8Junction&Item=N82E16881183095&utm_medium=Email&utm_source=IGNEFL112218&cm_mmc=AFC-C8Junction-Slickdeals LLC-_-na-_-na-_-na&ignorebbr=1&cm_sp=
My friend tommy found this one... https://www.ebay.com.au/itm/HIKVISION-OEM-8CH-4K-CCTV-KIT-DS-7608NI-I2-8P-NVR-4MP-Dome-IP-IR-H-265-HD-Camera/263561965076?var=&hash=item3d5d846e14