Adopting DevSecOps practices is critical for modern software development, yet small businesses face significant barriers such as high tooling costs, limited expertise, and integration challenges. This paper presents a cost-efficient DevSecOps framework specifically designed for small teams, emphasizing open-source tools, risk-based prioritization, and scalable practices. The proposed framework is validated through real-world implementations in Spring Boot, Laravel, Flask, and Express.js environments, achieving cost reductions of up to 93% while maintaining security standards. By addressing key adoption challenges, this framework empowers resource-constrained teams to integrate security seamlessly into their development workflows. Future work includes enhancing automation, industry-specific adaptations, and fostering community collaboration to address emerging security needs.