I have looked around to purchase a beach/oversize umbrella, here's where I've been so far-
both walmarts(because that's where the locals sent me), Sorianas, 3 different Ley's, Home Depot, Juarez Market on Sunday, Centro Market, all surrounding Coppells. I've walked the malecon near the golden zone.
Any direction will be appreciated we are here until July 21st. so I think is will be a worthwhile investment.