Finding affordable brown mascara can be a bit of a challenge, but there are several places where you can find quality products that won't break the bank. Here are a few suggestions:

1. **Drugstores**: Your local drugstore is a great place to start. Brands like Maybelline, L'Oreal, and CoverGirl offer a variety of brown mascaras at affordable prices.

2. **Online Retailers**: Websites like Amazon, Ulta, and Sephora also carry a wide range of brown mascaras. You can often find deals and discounts on these sites, making them a good option for affordable shopping.

3. **Discount Stores**: Stores like TJ Maxx, Marshalls, and Ross often carry high-end beauty products at a fraction of the original price. You might be able to find a brown mascara from a luxury brand at a much lower price point.

4. **Direct from the Brand**: Many makeup brands sell their products directly from their websites. Brands like NYX, e.l.f., and ColourPop offer affordable, high-quality brown mascaras.

Remember, when choosing a mascara, it's not just about the color. You also want to consider the formula and the type of brush. Some mascaras are better for lengthening, others for volumizing, and some offer waterproof formulas. It's important to choose a product that suits your specific needs and preferences.