The tools is good advice most of the time, but not if the tool would fail dangerously. Don't skimp on car jacks, table saws, or other things that are likely to injure you if they fail.
Screwdrivers/drills/hammers/crowbars/etc. don't need to be expensive if you are going to use them rarely as the professional grade is mostly about being used all day every day and being able to survive rough handling by tired workers.