Where can I buy a good assortment of welding rods, I like 7018[ low hydrogen, very strong] and 6011 which we always called a dirty rod capable of welds through rust, paint etc. I only see 6013 where I shop. Might be nice to have some Blue Max for stainless too. 

7018 is great if the area is clean, its sold everywhere like Global, Thai Wasadu, Home Pro, same as all the other rods. 

 

Locals will probably have a hard time trying to use 7018 as the fitment, gap, cleanliness, and position are imperative. Its a pain in the dick trying to gap fill thin metal in a vertical/overhead position with 7018. 

 

Have you checked the big building stores? 6010, 6011, 6013, 7018 common.