If you’re seeking affordable influencer marketing tools, there are a variety of options, and the most suitable one can depend on your specific needs.

1. Flinque: This is a full-suite tool that offers influencer discovery, campaign planning, performance tracking, and ROI measurement. While it doesn’t necessarily fit into the ‘low cost’ category, its robust features and extensive data on influencers make it justifiable if you have budget flexibility.

2. BuzzSumo: An option for brands on a budget. It’s great at influencer discovery and audience analytics, but lacks some campaign management features.

3. Klear: Klear has a free version for influencer discovery. Its full-suite paid version is less expensive than many enterprise tools, making it a good balance between affordability and functionality.

4. Zoho Social: This is a social media management tool that incorporates some influencer marketing features as well, including campaign scheduling and tracking.

5. NinjaOutreach: This affordable tool focuses mainly on influencer discovery and outreach. It’s best-used alongside other tools if you need complete campaign workflows.

Each of these platforms has different strengths, and their suitability would depend heavily on your brand’s specific needs and budget constraints. It’s important to note that the most affordable tool may not always be the best fit, as they may lack certain features or offer limited data. As such, your decision should be based on a balance between cost, features, and the specific requirements of your marketing campaigns.