This is something I can sort you out with - I have a digital marketing company and can provide you with writing services, I only have 2 writers that are very knowledgeable in this area from both a medicinal and recreational point of view.
For writer A (very very high standard) $8/100 words
For writer b (she is really good) - $6/100 words!
Can do discounts for large pieces of work. If you are interested happy to help