Ancient 宜 showed meat neatly arranged on a sacrificial stand beneath a roof — everything in its proper place. Propriety became suitability: what fits is 宜.
便宜 (piányi) 'cheap' is the word every market traveler learns first — 便宜一点吧! 'a little cheaper, come on!' Alone, 宜 keeps its dignity: 适宜 suitable, 宜人 pleasant, and the city 宜宾 or brand 宜家 (IKEA — 'suitable home', a perfect translation).
Everything properly placed under the roof 宀 — SUITABLE; a suitable price is CHEAP.
IKEA's Chinese name 宜家 quotes a 3,000-year-old line from the Book of Songs — 宜其室家, 'fitting for home and family'. The best brand localization ever shipped flat-packed.