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Walmart [walmart.com] has 54" x 78" Mainstays Medium Weight PEVA Shower Curtain Liner (Frosty) for $ 1.24. Shipping is free w/ Walmart+ (free trial available [walmart.com]) or on orders $ 35+.
54″ x 78″ Mainstays Medium Weight PEVA Shower Curtain Liner $1.24 + Free S&H w/ Walmart+ or $35+
72″ W x 84″ H 8G PEVA Extra Heavy Weight Shower Liner