List at least 300 dietary supplement companies(finished products in a
dosage form i.e. capsule, tablet, softgel)with contact information,
that market their products over the internet(i.e. Swanson Vitamins).

Chubby, 

You might want to adjust your price. 300 companies's contact details
for the rate of $37.50 (which is what is left to the Researcher from
$50), is $0.12 for each company.