The cost of obtaining protein from different sources can vary widely based on several factors, including geographical location, market conditions, seasonality, and specific product brands. Here’s a general overview of various protein sources and their approximate costs per 100 grams of protein, along with examples of common sources:

 The cost of obtaining protein from different sources can vary widely based on several factors, including geographical location, market conditions, seasonality, and specific product brands. Here’s a general overview of various protein sources and their approximate costs per 100 grams of protein, along with examples of common sources:

### Animal-based protein sources

1. **Chicken Breast**  

   - Approximate Cost: $2.50 - $4.00 per pound  

   - Protein Content: ~31g per 100g  

   - Cost per 100g of Protein: $0.80 - $1.30

2. **Ground Beef**  

   - Approximate Cost: $3.00 - $6.00 per pound  

   - Protein Content: ~26g per 100g (for lean beef)  

   - Cost per 100g of Protein: $1.15 - $2.30

3. **Eggs**  

   - Approximate Cost: $2.00 - $4.00 per dozen  

   - Protein Content: ~13g per 100g (approximately 1 large egg)  

   - Cost per 100g of Protein: $1.50 - $3.00

4. **Fish (e.g., Salmon)**  

   - Approximate Cost: $8.00 - $15.00 per pound  

   - Protein Content: ~25g per 100g  

   - Cost per 100g of Protein: $3.20 - $6.00

5. **Greek Yogurt**  

   - Approximate Cost: $1.00 - $2.00 per cup (8 oz)  

   - Protein Content: ~10g per 100g  

   - Cost per 100g of Protein: $2.00 - $4.00

### Plant-based protein sources

1. **Lentils**  

   - Approximate Cost: $1.00 - $3.00 per pound  

   - Protein Content: ~9g per 100g (cooked)  

   - Cost per 100g of Protein: $1.10 - $3.30

2. **Chickpeas**  

   - Approximate Cost: $1.00 - $2.50 per pound  

   - Protein Content: ~9g per 100g (cooked)  

   - Cost per 100g of Protein: $1.10 - $2.80

3. **Tofu**  

   - Approximate Cost: $2.00 - $4.00 per pound  

   - Protein Content: ~8g per 100g  

   - Cost per 100g of Protein: $2.50 - $5.00

4. **Quinoa**  

   - Approximate Cost: $3.00 - $7.00 per pound  

   - Protein Content: ~4g per 100g (cooked)  

   - Cost per 100g of Protein: $7.50 - $17.50

5. **Peanut Butter**  

   - Approximate Cost: $2.50 - $5.00 per jar (16 oz)  

   - Protein Content: ~25g per 100g  

   - Cost per 100g of Protein: $1.00 - $2.00

### Summary

When assessing the cost-effectiveness of protein sources:

- **Animal protein** tends to be more expensive per gram of protein than many plant sources, but it also provides complete proteins (all essential amino acids) and often higher protein density.

- **Plant-based proteins** can be more budget-friendly and provide additional health benefits, such as dietary fiber, but they might lack one or more essential amino acids (except for some sources like quinoa and soy).

Prices will vary based on local market conditions, so it's a good idea to check your local store or market for current prices.