Chicken, beef, cottage cheese, eggs/egg whites. Make friends with your butcher or stock up when the deals come around. Whey shakes are pretty crapulent outside of PWO, and powders (casein or w/e) in general may not agree with people + are expensive + not sustainable. For an average 150lb guy getting 200+g of protein daily to support the demands of lifting and growing is not that hard if you alter what you eat. Considering most people eat at or above maintenance anyways, taking out bad food sources and adding in protein can do great things. Even if you aren't lifting, protein is good.
Sure, you don't "need" excess protein, just like you don't "need" excess carbs. I hate to quote studies, but
There is convincing evidence that a higher protein intake increases thermogenesis and satiety compared to diets of lower protein content. The weight of evidence also suggests that high protein meals lead to a reduced subsequent energy intake. Some evidence suggests that diets higher in protein result in an increased weight loss and fat loss as compared to diets lower in protein, but findings have not been consistent. In dietary practice, it may be beneficial to partially replace refined carbohydrate with protein sources that are low in saturated fat. Although recent evidence supports potential benefit, rigorous longer-term studies are needed to investigate the effects of high protein diets on weight loss and weight maintenance.
Not a slam dunk but uhh yeah there isn't really a good reason to eat less protein if you are at all concerned with body comp, athletic performance, general well-being or anything past complete apathy towards your body.
My own daily intake not counting dinner:
4 eggs, 1 cup cottage cheese, 8oz any given meat, 2 scoops casein totals roughly 150g of protein, and thats not even counting "coincidental" protein from other food sources ie. cheese, bread, rice etc. throw in a PWO shake and more meat for dinner and you're well over 200g.