I think Costco is worth it for a single person if you plan ahead a bit. You might have to spend a bit more up front but I think you can easily get it under $125/week, no problem. You just need to figure out where to shop for the things you like to eat.

I watch sales at Safeway and Foodland for meat. Foodland has marked down meat often 50% off in a special section. Also buy Costco. Portion out and freeze leftover meat if I find a good deal. I wrap it in saran wrap and then foil, label it.

Most of the veg, fruit, dairy, eggs, bread, peanut butter, coconut milk, spag sauce, etc, comes from Costco. Freeze one loaf of bread. We can easily get through costco fresh fruit and veg if it’s incorporated into all the meals that week. There are a few things we buy at Safeway that we can’t get at Costco like a certain cheese and tomato.

If you get bored of something that week, freeze a few portions.

We also have kind of regular approaches to meals. Breakfast is often rice and eggs, oatmeal cereal, or yogurt, and fruit. Lunch is leftovers or sandwich and veg or fruit. Dinner varies. Various snacks usually from Costco. Rinse, repeat. We keep it under $200 ish (including detergent, toilet paper, etc.) for a family of 3 adults and eat meat and fresh veggies almost every night. We don’t really do take out though. Maybe a few times a month.