Examples: californium, americium, curium, iridium, rhenium, osmium, palladium, francium, astatine, technetium.
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It's difficult to answer this question specifically due to ever changing prices and the difficulty in getting information on certain elements. By far however the transuranic elements are the most expensive because of production and permit costs. Plutonium can cost around $4,000/gram and Californium can cost $10/mg or $10,000/gram.
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Please follow the links for some of the elements in the periodic table (link attached) and read the articles.
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Californium is a highly expensive element, with estimated market prices around $25-30 per microgram. This makes it one of the most expensive elements in the world due to its rarity and complex production process.
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The most common elements in the Universe are hydrogen and helium. For additional elements, check the Wikipedia article on "Abundance of the chemical elements".