Researching most affordable GPS chips with sensor capability

Hello! I'm conducting extensive research trying to find the most affordable GPS chip on the market now, capable of also having a sensor chip that senses and measures body temp and/or heart rate of large mammals. I'm working on a multi-phase program involving inserting these chips into ear tags for livestock in predator dense areas for consercation of predators and livestock in predator areas. MUCH more happening with this project but this is a start. Would love to hear from someone. And this is an amazing community. 

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