Cost efficient cooked chicken breast source/supplier

Saw an ad for NutritionKitchen_sg on instagram, it's got chicken breast for $15/500g

This means I would be spending approx $105/week

For mealprep, I'd spend $41.55/week

What other options are there for precooked chicken breast in the range between $42-105 for 3.5kg a week?

My metrics here are 1) chicken breast 2) availability and 2) hygiene, taste is mostly irrelevant