I still have a dozen parts bins full of the good old "42IF1xx" parts that Mouser has always sold, along with a bunch of Digikey's Toko cans. Seems a shame that they're not there any more...or are they?
Checking Mouser...I punched in the number for a familiar old friend: "42IF123" on Mouser's site, and yep, it's still there! They have both 455 kHz and 10.7 MHz IF transformers, with and without capacitors. Here's a .pdf of that catalog page:http://www.mouser.com/catalog/catalogUSD/639/1022.pdf
You can also find one model each of the popular 455 kHz and 10.7 MHz IF transformers on W8DIZ's site at a good price:http://www.kitsandparts.com/inductors.php
Hope these help. Keep the iron hot!
Dave - K7DAA