Is there any cheap tuya plugs you can flash ota on amazon (USA type plug, and UL)?
No. Those days are over. I switched over to Zigbee for my plugs and haven’t looked back.
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Cheap tuya Zigbee switches can be flashed with custom firmware too 
is there any cheap plugs you can flash ota (US type plug)
If you asked this 2 years ago, there was plenty option but tuya pretty much has patched the exploit for cloudcutter on most of their devices by now
You could probably just go with martin jerry, kauf or athom plugs