A microchip for 0.5$ ??? Where do you get it from? China? US?
The cheapest one I use is ATtiny 13 which costs in my country 2.02€ (~3$ I think!) . When I import them from Germany, I get them for 1.80 € (above 10 pieces) and I have to pay for delivery. I've been using them for some years now, and trust me, if they were to get cheaper for me, I wouldn't waste money.
A relaise, that can stand 1A is not as cheap as you said, at least in my country. I looked for the cheapest components.
A passive security system would be worth some thinking: E.g. A PTC resistor and a transistor. When heated above, say 70°C, the PTC gets so much resistance that it cuts the relaise off.
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