I use one in my work drill and I can't stand them, they overheat quick etc. I'm not sure if that's a DeWalt thing or not but like u said it will cost a lot it was about 250 for the one in my drill.
What's up nate this is mark from jbody
Why don't you buy a power supply that adds up to the fuse rating of the amps or close to it then go from there. They are not cheep but it will give you the power you need plus it only has a + and - on it so u shouldn't be able to mess anything up. I haven't checked but I don't think a computer power supply putting out that much current. Oh and like said above if you don't know how to read what the instructions say that come with the psu and u have to ask then don't risk your parents house burning down