Watermelon and feta are both available year-round at every Charlotte chain, though watermelon peaks June through August when local North Carolina melons hit stores at rock-bottom prices; balsamic vinegar is standard pantry stock. The 10-minute claim is honest—cubing watermelon and crumbling feta takes exactly that—but the real cost driver is feta, which runs $8–12 per pound at Harris Teeter or Food Lion, making this hit $3–4 per serving even with cheap watermelon. This is a no-cook side that does not reheat well (feta weeps, watermelon softens), so it's a same-night summer dish, and it's fussy enough to feel special without actual cooking skill, though the flavor payoff depends entirely on good-quality feta and not overdoing the vinegar.