You can get the tiger lotus from Walmart. They are sold as bulbs, and usually conform to their environment. Meaning they will stay small if they don't enough room to grow. Plus, if you let them reach the top, they can flower. I've only seen the flower in people or white though.
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Good Old Walmart doesnt sell Tiger Lotus bulbs unfortunatley, they do sell Dwarf Lily's though, ive had them and Tiger Lotus before and they do look similar.
I would suggest the dwarf Lilly, its really easy and adds some really cool features to your tank, ive got 2 of those bulbs sprouting at the minute and i cant wait for them to get full sized! the last dwarf lilly i had i loved