The reason I ask is that I can usually get them for roughly plus or minus dollar each at walmart or aldis. I usually choose the ones that are in water. I never see them there packed in olive oil. That might be better but its unlikely that the quality of the olive is all that great. Olive oil is best extra virgin 1st cold pressed. Wegman’s house brand california 1st cold pressed extra virgin olive oil is suprisingly cheap. Also, trader joes has some low cost high quality olive oil. Usually at aldis or walmart— they pack sardine tins with poorer quality oils or mustards. I’ll buy those if sardines in water is not available—and then washout the mustard or poor quality oil.
Buy it once and eat it.