I have a household of two and when I bake a chicken I use a 6 3/4 quart. Brands vary wildly in price.

Maybe this one?

Lodge 7.5 Quart Enameled Cast Iron Dutch Oven. XL Red Enamel Dutch Oven (Island Spice Red) - EC7D43 https://www.amazon.com/dp/B0039UU9UE/ref=cm_sw_r_cp_api_i_E-IJEbYYVQWV2