Sales and raw material costs are two of the most tightly guarded pieces of information at any company. To complete this project, I will rely upon my vast research experience in the pharma/biotech industries. I bid confident that my approach, experience and thoroughness will be among the best you'll find, but getting to the data you need is a challenge no matter who you hire.
I would conduct desk research for sales by product. I'd scour (English) sources including blogs from the street, company websites, industry associations, government reports and other publications and begin to develop a report that we can share on a weekly or bi-weekly basis.
I suggest a competitive intelligence approach supplement secondary efforts, rather than formal marketing research. Interviewing distributors/customers, industry experts and if possible, company insiders (English speaking) may help uncover the proprietary tidbits of information that we can pull together like puzzle pieces. The major caveat to my proposal is that I can only conduct research in English, and these companies are Chilean, Arab and Israeli.
The scope should be organized in advance because there are at least 56 products to be researched. Haifa offers 30 products in four categories (water soluble and controlled release fertilizers, food phosphates, others). SQM sells 20 products in six categories to 100+ countries WW in six categories and KEMAPCO produces three products.