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DigisparkDigispark comes to mind, or any of the ATTiny breakout boardsATTiny breakout boards at Tindie. Or, make your own PCBs, I just now finished soldering a few ATMega328p circuits to boards I designedboards I designed. Microcontroller is $1.50, PCBs range from $2 to $8 each, time is "free."

Also consider "compatible with" designs; while you're not directly supporting the ecosystem, if you've already paid full price once and your conscience is clear, eBay has plenty.

Digispark comes to mind, or any of the ATTiny breakout boards at Tindie. Or, make your own PCBs, I just now finished soldering a few ATMega328p circuits to boards I designed. Microcontroller is $1.50, PCBs range from $2 to $8 each, time is "free."

Also consider "compatible with" designs; while you're not directly supporting the ecosystem, if you've already paid full price once and your conscience is clear, eBay has plenty.

Digispark comes to mind, or any of the ATTiny breakout boards at Tindie. Or, make your own PCBs, I just now finished soldering a few ATMega328p circuits to boards I designed. Microcontroller is $1.50, PCBs range from $2 to $8 each, time is "free."

Also consider "compatible with" designs; while you're not directly supporting the ecosystem, if you've already paid full price once and your conscience is clear, eBay has plenty.

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Digispark comes to mind, or any of the ATTiny breakout boards at Tindie. Or, make your own PCBs, I just now finished soldering a few ATMega328p circuits to boards I designed. Microcontroller is $1.50, PCBs range from $2 to $8 each, time is "free."

Also consider "compatible with" designs; while you're not directly supporting the ecosystem, if you've already paid full price once and your conscience is clear, eBay has plenty.