Those coils are few and far in between. They stopped making them over 15 years ago. Your best bet is to find another unit you take one off of( like ebay ), or modify a newer one to fit.
The company that is handleing parts for this now is MTD. Any MTD dealer can order this part. The new part number for the Ignition coil is: 725-04320
Prices can vary according to the dealer from $ 53.00 to $ 63.00 plus freight depending on their mark-up.
The Distributor for MTD is Oscar Wilson. They have 9 of these in stock. (I checked thir inventory.
WWW.oscar-wilson.com is their website. You will have to use the dealer locater to find someone to sell it to you. I am located in Greenfield, Indiana 46140
IT will always show the waiting for me...because I was the last one to respond to this post. Just leave it alone. I alsway respond last on purpose do I don't get a tremendous number of messages in my inbox telling me I need to respond to a question. This is because this site allows you to continue a conversation even after the payment is made.
For future reference, you can close a question anytime by clicking on the "Close Question" link at the top right portion of the original question.
Usually they will ask you why you want to close the question. Just type in....Satisfied answer.... and this will end it.