I'm basically a cheapskate and paid $80 for 4x 2tb HDD and they've hit $120 as reputable SSD and stuck. I keep hoping they'll drop lower but I need SATA form factor and I fear they will only drop in m.2 form now, SATA is dying. SATA to m.2 carrier boards are $20

2.5" sata SSD are falling in price about about the same as m.2 nvme sata, here's a 2TB for $62 [1] (not an endorsement, just an option; always be confirm your ssds have the features you want: bits per cell?, dram?, controller?, secure erase?, etc)

m.2 sata is available at similar prices too, but many fewer choices. mSata seems to have topped out at 1TB

[1] https://www.amazon.com/dp/B07Q37V1C9

US/AU $ works out my price at $92. Plus postage. But, encouraging!