Hate to rain on your parade, but big box stores are a lousy place to buy toilets. They specialize in builder grade junk. As you have discovered, getting advice from their sales force is often a joke. Kohler and American Standard are not the great companies they built their reputation on. AS dumps their blems on them so frequently folks find they have to take them back, sometimes more than once. A lot of the professional plumbers will not mess with them for that reason. I think in fact you can order a Toto from a plumbing shop, perhaps not all of them, but some will do it. Many of us on this forum favor the Toto brand, but they are not sold in discount centers.