In America, all of that other than the paint is available at the dollar tree. You're looking at ~$7 to fix the hole (spackle, mesh tape, trowel, sandpaper, paintbrush) and $12 to buy a pint can of matched paint, as long as the hole is smaller than your fist.

Larger you would need to add in a $20 patch panel of sheetrock, a razor knife or other sheetrock saw (could probably use the bread knife in a pinch) and a hammer and nails, so closer to $50 all in.