Found the following source for the circuit breaker, still under $25 & easy to get with Amazon.
E-T-A Circuit Protection and Control 2-5700-IG1-K10-DD-20A , Circuit Breaker; Therm; Push; Cur-Rtg 20A; Panel; 1 Pole; Vol-Rtg 250/28VAC/VDC
by DISCOUNTLAND
Learn more: https://www.amazon.com/dp/B00DECXBA2/ref=cm_sw_em_r_mt_dp_U_UV4pCb8MFEYWX
E-T-A Circuit Protection and Control 2-5700-IG1-K10-DD-20A , Circuit Breaker; Therm; Push; Cur-Rtg 20A; Panel; 1 Pole; Vol-Rtg 250/28VAC/VDC
by DISCOUNTLAND
Learn more: https://www.amazon.com/dp/B00DECXBA2/ref=cm_sw_em_r_mt_dp_U_UV4pCb8MFEYWX