This site list small Computer and Radio Parts
I will no longer be shipping outside the US.
There is a problem with the site's software, products disappear from the catalog every once in a while, if you are looking for something that used to be here but now isn't, let me know and I will look into it.
The 42IF123-RC transformers are back in stock, the distributor I purchased them from bought a new business and closed the old business so I lost contact, but all is well now although supplies are not guaranteed to be available forever. As soon as I have can afford it, I will buy a big lot of these parts to make sure I have an ample supply.
Please note that most parts offer discounts at Qty 3, 5, 10, 25
At http://files.k5nwa.com/tpp you will find data and application notes on the current parts and parts I'm considering adding to this website. Right click on the file of interest and select save.