Bmi, turk brothers, comet kart sales, jc specialty, and a few more but I can't remember right now. I am sure someone else will chime in on who else.
I spend a lot with Omb warehouse and bmikarts, and never have issues. I stay far away from
I've noticed omb warehouse is on ebay, and stuff on ebay is cheaper than omb sells it on their website, I think it's cheaper shipping usually.
Make sure you know what your buying . also that you can use it or modify it too work .
Kart shops aren't amazon or wal-mart .