Fish Oil Wholesale

I'm running out of money and I was wondering if fish oil supplements from places like Sam's Club, Costco, Wal-Mart would work well (or at least decent). Does anyone here buy their fish oil from any major site rather than a health food store? Is it effective? I will try this temporarily until I get more money.

I take 1000 mg EPA, DHA amount is not as important. I take mood and help with concentration / brain.

Yes, they work almost as good.