You can get square rubber pads with centre depression (just right for tripod feet) from Bunnings for around $5 - you'll want the largest size, which is about 6cm on side.
Or, you can get wooden "cups" with felt pads, again from Bunnings, for around the same cost - I suggest the "tiered" style - you'll know them when you see them.
I prefer the wooden/felt stuff indoors and the rubber pads outdoors on hard surfaces. On grass, I use wooden fence paling off-cuts to provide a stable surface.
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