TempController-v1 BOM [ Sparkfun Part No]
 
1x IC socket 28DIP .3” pitch [Digikey  3M5480-ND]
1x atmega168-20PU [ Digikey  ATMEGA168-20PU-ND]
1x Custom PCB
1x LM317 
2x 22pF Ceramic Capacitor [Digikey 490-4153-ND]
1x .1uF Ceramic Capacitor [Digikey 490-5369-ND]
1x 100uF Electrolytic Capacitor [Digikey P5152-ND]
2x 10k Resistor [COM-08374] 
1x 5k Resistor [Digikey CF14JT5K10CT-ND]
2x 1k Resistor [COM-08980] [Digikey CF14JT1K00CT-ND]
1x 720 Resistor [715 - Digikey CMF715QFCT-ND]
1x 240 Resistor [Digikey CF14JT240RCT-ND]
1x LED
1x Potentiometer [Digikey P3Y3103-ND]
2N3904 Transistor [COM-00521] [Digikey 2N3904TFCT-ND]
1N414Diode [COM-08588] [Digikey 1N4148FS-ND]
16Mhz Crystal [Digikey X176-ND]
1x 120VAC 15A Relay [COM-00101] [Digikey PB1014-ND]
3x2pin screw terminal [PRT-08235] [Digikey ED2635-ND]
Total $12.94

C1 - 22pF
C2 - 22pF
C3 - .1uF
C4 - 100uF

R1 - 10k
R2 - 5k
R3 - 1k
R4 - 1k
R5 - 10k
R6 - 720
R7 - 240