Quite an easy one really. Get yourself a fast car and chase after him. You can't kill him, but instead you have to get him out of his car so you can beat him up. You can do this by either ramming his car (thus stunning him) then pulling him out, or you can shoot his car until he bails out. The latter is a bit riskier, as you might kill him or the car will explode. Once he does come out, beat him up, take the tapes and return them to Fidel.
You can now buy the store for $160,000. If you have Montana Holdings it will cost you $144,000.