There are some top college for lateral entry and fees are given in round figure

• RV College of Engineering, [RVCE] Bangalore

fees -2.4 lakhs

• Ramaiah Institute Of Technology [MSRIT], Bengaluru

fees -3.47 lakhs

• BMS College of Engineering, [BMSCE], Bengaluru

fees -90 thousands

• Siddaganga Institute Of Technology [SIT], Tumkur

fees -2.4 lakhs

• Veermata Jijabai Technological Institute [VJTI], Mumbai

• Anna University, Tamil Nadu

fees -2.3 lakhs

• Jadavpur University, Kolkata

fees - 1 lakhs

• Thapar Institute Of Engineering & Technology, Punjab

fees - 16  lakhs

• PSG College Of Technology, Coimbatore

fees -2.9 lakhs

• Amity University, Uttar Pradesh

fees - 8 lakhs

• Manipal Institute Of Technology, Manipal

fees- 18 lakhs
For more information after diploma then btech you can visit here
https://engineering.careers360.com/articles/b-tech-after-polytechnic

Thank you. I hope this answer helps you.