The prices I put in here will probably change by the day but they give a good idea of the approximate value of these items
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NodeMCU development board with integrated OLED display - 6,84€ from AliExpress
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DS18B20 Temperature Sensor - 1,22€ from AliExpress
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10x15mm Power Switch - 1,18€/5Pcs from AliExpress
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Relay - 1,44€ from AliExpress
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230V to 5V AC/DC Converter - 2,77€ from AliExpress
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Power-in plug - 1,47€/5Pcs from AliExpress
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Push Buttons - 2,19€/6Pcs from AliExpress
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4k7 Ohm Resistor
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Some cables
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A halogen lamp with the proper mount and cables on it (as a heating element)
- You can choose to use a proper dedicated heating element but since halogen lamps convert 90% of the input energy into heat you might as well use on of them :)