Ande 50lb clear mono.
If you really like Varivas flourocarbon 50#, then I would google. I.e., there has to be a shop with overstock or some stock still on hand. You may also find a shop that will ship to the US (e.g., Canadian online vendor). If you get lucky, stock up.

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Why is Seaguar fluorocarbon junk? How is Varivas fluorocarbon technically superior to Seaguar fluorocarbon?