Amazon has Permanent Threadlocker, 6mL Bottle, Red for $2.08 with Free Ship with Prime or $25 Purchase.
https://www.amazon.com/gp/product…UTF8&
Amazon also has Stens 751-479 Medium Strength Thread Lock for $2.60 with Free Ship with Prime or $25 Purchase. Both are good prices.
https://www.amazon.com/Pro-Seal-2…T3ZHW8G6EP