There is no fixed price, but you get exactly what you pay for. In Algeria, you will find three main options:
The Freelancer (Cheap): They charge per post or a small monthly fee. Good for basic designs, but they usually don’t have a deep strategy to actually bring you sales.
The « Boost » Page (Waste of Money): People who just click the « Boost » button on Facebook for you. Avoid this—you are just paying someone to waste your budget.
The Professional Agency (Investment): They charge a monthly retainer because they provide a full team (copywriter, media buyer, designer). They focus on your ROI (Return on Investment) and tracking your actual sales, not just likes.