The most expensive species are those that are only occasionally shipped to the USA and haven't been bred in captivity, like Piraya, Brandtii and Manueli, among others...
Check out www.sharkaquarium.com or www.fishpost.com to view the price lists.
Where I live (Holland), they only sell redbellies, ranging from 3-4 bucks for 1" fish to $12,50 for 5-6" specimen.
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