do tesco sell next gift card

Posted 16th Jan 2016Available: National
I want to pay my next balance off & I read on here somewhere that if I buy next gift cards from tesco then I will get tesco reward points! I can't find next gift cards on tesco online, do they sell them instore? Also my balance is £300 will they have that amount of gift cards in stock?
Thanks in advance for any helpful answers.
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