Option A.2 by clever

http://www.digikey.com/product-detail/en/DS18B20U%2BT%26R/DS18B20U%2BT%26RCT-ND/3894805

$4.49 for a surface mount version of the temp sensor

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Product Quantity Subtotal
Solid State Relay - 8A
In stock COM-10636
1 4.95
One Wire Digital Temperature Sensor - DS18B20
In stock SEN-00245
1 4.25
ATMega328 - TQFP
In stock COM-09261
1 4.25
Total: 13.45