5 pack of cheap MicroSD. Cheap enough to throw in the drawer as a last line of back up when full. I have given some to less technical family for back ups of their MacBooks or other computers with low storage. Another stores a bunch of retro ROMS for a raspberry pi.
I bought a 1Gb IDE drive in the 1990s for $300…
Update 31 Oct: Back in stock, small price increase from $68.50 to $68.80
Shut up and take my money!