WalMart has the Texas Instruments TI-30X 2-Line Scientific Calculator (Black/Blue) on sale for $8.88 with free in-store pickup. 

This received 4.6/5 stars based on 123 customer reviews. It was also rated 4.5/5 stars based on 2,242 customer reviews at Amazon, where it is available for the same price (a historic low according to Camelcamelcamel ).

Alternatively, it is available for $8.00 at Target in-store only. Link for reference

  • 2-Line Display
  • Easily handles 1 and 2 variable statistical calculations
  • 3 angle modes (degrees, radians, and grads)
  • Scientific and engineering notation modes
  • 1 Year Limited Warranty

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The model is the TI-30XIIS, not the TI-30X (there are many versions of the TI-30X, some not being 2 line.)

That being said, IMHO the Casio FX300ES-Plus is a much better 2 line calculator.

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