You can try and connect with some other people who live near you. That way you could split up the shipping.
Tilapias usually aren't picky eaters. You could experiment supplementing their feed with something you can source locally. For example setup a black soldier fly farm based on food scraps. Larvae are yum. :) I've fed my tilapia old lettuce as well with some luck. They don't love it, but will eat it.