Full-Stack E-commerce Website Development

I am looking for an expert in React and Next.js to help me build a dynamic, multipurpose e-commerce website. The site should have both admin and super admin features and accommodate sales of both physical and digital goods.

Key requirements:
- Comprehensive product sales support
- Dual product type handling (physical & digital)
- Integration of PayPal as the primary payment method

Please share your estimated timeline and budget for this project. Thank you.