redmax, Stihl, shindowa, parts online?

I am tired of dealing with feeble dealers who can not get me the right parts on anything I own. Is there a place to get throttle cables, quality oil filters and other stuff from online. I use J-Thomas, Mow more, and a couple others, but they do not carry everything. Any other ideas would be great, specifically the redmax as they seem harder to find.

Thanks
Jay