Hello there,
Here are some colleges offering BSc Food Science, B.tech Food Technology and BSc Agriculture.

For BSc Food Science or Food Technology:
1. Dr. BMN College of Home Science
2. SNDT, Mumbai
3. DY Patil University
4. Symbiosis International University, Pune

For BSc Agriculture:
1. SNDT, Mumbai
2. College of Agriculture, Pune

For B.Tech Food Technology:
1. ICT Mumbai
2. College of Food Technology, Murbad

These are some of the cheapest colleges offering the courses you have said.

Hope this answer helps you.
Good luck!!