Id go to McMaster Carr but I dont know the size of the nut.
I msg'ed him back with their site and got this in return. Makes you wonder how many people they have screwed over the years with their BS freight charges. At least Dan seems to have a wee bit of interest in the issue.
"I apologize for the issue. Everything is entered into our system automatically based on category. I believe that the nuts you’re looking for are falling into a category that is not giving a proper weight value which is why there’s such a big shipping cost. I have contacted my websites tech support and hopefully they will be able to figure out this issue. Thanks so much for your patience.
Dan C
Customer Service
The Grease Squad | Auto Parts Supersite
P: 888-521-1222 "