Introduced in 2009 together with a new iMac line, the “compact” Apple wired keyboard was basically identical to the standard wireless keyboard but it also featured two USB ports on its sides. As noted by AppleInsider, that keyboard has been quietly discontinued by Apple, as it is not offered as an option on the online store anymore.
Part number is MB869LLA, and it’s still available on some retailer websites – until they run out of stock, I guess. Apple’s wireless keyboard that ships by default with every new desktop Mac is available here at $69.