Cost depends on complexity, not size, so it’s hard to tell whether $3.5k is little or a lot. For price, it changes a ton with volume. You can estimate searchin

Cost depends on complexity, not size, so it’s hard to tell whether $3.5k is little or a lot. For price, it changes a ton with volume. You can estimate searching components on mouser. If I were you, I’d look for someone willing to do design that you can trust more, or work with crowdsupply/indigo go/kickstarter and get connected to their referrals for a comparison. Happy to chat more, feel free to email me.