TheCortez is actually a decent fin, made by XS Scuba and around 50$. There are some in the local shops rental fleet and are quite popular to be picked out first. Considering the shop also has cressi and scubapro in rental it's not just a name identity thing.
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<DIV>The Oceanic Viper actually surprised me in how well it did when we tested out fins.</DIV>
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<DIV>Or you can buy used there's nothing wrong with used gear.</DIV>