Your best-selling SKU just went out of stock. Again. It's 2am. You're refreshing Seller Central and your hero SKU — the one doing 40% of your monthly revenue — shows Currently unavailable . Your BSR is tanking. Your organic rank is evaporating. And the reorder you "meant to place last Tuesday" is still sitting as a draft in your notes app. If you're a solo FBA seller managing somewhere between 20 and 200 SKUs, you know this feeling. The store is big enough that you can't eyeball it anymore, but not big enough to justify a $200/month inventory SaaS or a virtual assistant who actually understands lead times. Let's do the math on what one stockout actually costs you. The real cost of a single stockout I ran the numbers across my own store and a few seller friends. For a SKU doing $8,000/month at a 22% net margin, here's what a 14-day stockout actually costs: Cost bucket Amount Lost revenue (14 days) $3,733 Lost net profit $821 Rank recovery (est.…