Mouser has them:
http://www.mouser.com/ProductDetail/Texas-Instruments/SN74F253N/?qs=mE33ZKBHyE7IP7mBS4SId9FcAC2SzyMAP4b1f40%2fTO4%3d
Digikey does not have them. I looked for something compatible in a CMOS part, Digikey didn't have anything fast enough in a DIP package.