Share 'Trying to find the best deals on discs'

I have been playing disc golf for about ten years now.  I have decided to play competitively this year.  So, I have been trying a lot of new discs and it gets kind of expensive.  Can anyone tell me what internet sites have the best deals on discs?  I have heard there are factory second discs that are mis stamped or  have a cosmetic defect.  Where can you get those? and do they really fly the same…