I wonder why this chip needs to continue to be made.
People are selling them on eBay, too: http://www.ebay.com/sch/i.html?_nkw=74LS47
May I ask what you are using them for? When I started out with Arduino I bought a whole bunch of 74xxxx IC's. But haven't done much with them.
74ls47 is kind of pointless with a uC. Have to hold the inputs for it. Not daisychainable. Using shift register is a much better way to go. Daisychainable, mux-able.