Selling at a market

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I'm going to be selling in person at a market and will use Shopify POS. Is it possible to charge a different amount for my products that what they currently sell for on my website? I'm not offering a discount, I'd actually like to include the tax as a flat rate for each product, so that I don't have to fool with coins if anyone pays in cash. If it is possible, how do I set this up?