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Now she angleshoots me by saying OOT isn't representative, what's my next move OOT
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Wrap this up, and let her see the $19.99 price tag
Then grab it and start to beat her violently over the head with it. Tell her you'll give her the book and stop doing it for $25.
Either she'll realize that sometimes the market value of something is different than the purchase price or she dies with her last words being, "but then I'll be paying more than its wooooorth!!!!!"