Recommend burner flip phones and prepaid Sims and providers?
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Flip phones are under $50 for most brands, normally available in $25-$30 range.
You need to check which service providers have the best reception/coverage for your location/s first. Then you need to decide on whether you want a plan, or just pay-as-you go. Pay-as-you-go normally requires paying for a month at a time, and you get charged the full month's fee even if you don't use all the data & minutes of talk.
You need to decide if you need data and text or just voice, as different carriers have different plans and costs for each.
I'd pay for it with cash, and if you need to use a credit card to add minutes/features, use a prepaid VISA funded with cash. I'd also not order it online with my home or work address (or mom's, or a friend's, etc.). The whole point is to separate your identity from the phone so it can't be linked to you. If the store asks for personal info, say it's a gift, and the recipient will activate it later.
You might also want to think about getting a model/brand you are familiar with. It's much easier to find settings, such as disabling GPS.
Here's an example of a Walmart-branded phone that works with T-Mobile 4G networks.
https://www.walmart.com/ip/Walmart-Family-Mobile-Alcatel-MyFlip-2-4GB-Black-Prepaid-Phone/310204832