Hopkins 4-Wire Flat Tester with 6-12V Circuit Tester $1.53 +Free Prime Shipping

Amazon has Hopkins 4-Wire Flat Tester with 6-12V Circuit Tester for $1.53. Shipping is free with Prime or on qualifying $25+ orders.
Alternatively, Walmart also has Hopkins 4-Wire Flat Tester with 6-12V Circuit Tester for $1.53. Store Pickup is free or shipping is free on $35+ orders.
Note, Walmart requires a minimum purchase of 2.
This is for testing left/right turn, brake and tail lights while towing.
Links:

• Walmart
• Amazon