McMaster Carr will have them but they tend to be expensive.
MSC is much less expensive usually. They will also happily ship but not quite as fast as McMaster (I am w/in one business day of McMaster Carr and they have never, ever, 'missed' in over 30 years of doing business with them- if ordered before the cut- off time, it will arrive the next day).
Try single- ended end mills for inexpensive, end cutting tools. This is a starting place:
https://www.mscdirect.com/browse/tn/Milling/End-Mills/Square-End-Mills?navid=12106240#navid=12106240+4288247969Let me know if I can be of more help and I can wade through the choices (there are 25,000 listed above) after we figure out what, exactly, you need to do. I have both C-14 as well as ZX forks and so should be able to figure out the right size cutter, length needed and the shank size once I know the opening in your chuck (Easy Bob!).
Brian
Cannot find anything like this at Home Depot, Lowes AutoZone or NAPA. THe guy at NAPA searched his catalgue for 10 minutes and NADA. Going to look on McMasterCarr.