Where do I buy a power cord for a Makita circular saw and is it hard to replace?

make sure that your outlet is hot, once verfied that you have power going to the plug of the saw cord, verify that you dont have any breaks in the cord itself. once verified no issues with cord you can check for power at the switch, if there is power at the switch but not coming on, probably bad switch.

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Sorry, but my advice is to throw it away. With the 5380 anything more than a cord is not worth repairing.
My recommendation is to buy a Makita 5007 series and stay away from Skil.

Things to check: With the saw running, safely grab the cord by the boot and pull and twist it around. This is where a break frequently occurs inside the cord and when the saw is held in certain positions the break will either open or close. If the cord's OK, unplug the saw and remove the brush caps and check the brushes. If the brushes are less than 1/4" long or the springs are burnt or broke they won't make good contact with the armature. If the cord & brushes are OK your next recourse is to replace the switch (Makita PN 651172-0).

you can get it direct from them at 1-800-4 MAKITA(1-800-462-5482)

The cord ... or the switch ... or the brushes.

You will have to take the handle apart to access the end of the cord and check the switch. Test your cord with the ohm function of a volt/ohm meter.

Thanks for your question and good luck with your repair.

there are about 4 or 5 screws that need to be removed, sometimes you have to gently twist and remove.

here's a article on how to fix it.
http://www.amazines.com/Electronics/article_detail.cfm/78565?articleid=78565

the cord set you need is 664463-0, the wire guage is 2x14x8 SJ any repair shop should be able to help you with the proper wire guage cord for this tool. The installation is really easy after removing the handle half

yeah you will have to replace it. they sell a kit for it,