Hi Ray,

the Si4735 ic is not discontinued and can be found on Ebay, it is currently used in many radios and that's the one used in most projects shown in the Si47XX for Radio Experimenters facebook group;
Also check the Youtube channel of Ricardo Caratti the administrator to see some fresh videos https://www.youtube.com/user/pu2clr/videos
and his github for the library for arduino here: https://github.com/pu2clr/SI4735