Prime Big Deal Days 2026 opens October 6 – four days from today – and by now your watch list should be built. The question that actually decides whether you win the event is simpler: at what price is each model a genuine buy, and when should you wait? This guide converts our price-history tracking into a practical cheat sheet: for each popular robot vacuum and camera, the floor price to wait for, and the “not a real deal” red line to avoid. Based on past event patterns and 30-day street prices, not on live listings.
The short version: write these floors down. If a model hits its floor in the first 24 hours, buy; if it only matches its normal 30-day price, wait – the deeper cut usually relists during the noon PT daily rotation.
The price floors to wait for
- Roborock Qrevo Curv: wait for $1,049 or below. Normal street price is $1,199-$1,299.
- Roborock Qrevo Master: wait for $699 or below. Normal street price is $749-$899.
- Roborock Saros 10R: wait for $1,199 or below. It launched at $1,599 and sits near $1,299.
- Dreame X40 Ultra: wait for $749 or below. Normal street price is $899-$999.
- Ecovacs Deebot T50 Omni: wait for $949 or below. Normal street price is $1,099-$1,299.
- iRobot Roomba Combo j9+: wait for $849 or below. Normal street price is $999-$1,099.
- Shark PowerDetect NeverTouch Pro: wait for $449 or below. Normal street price is $599.
- Wyze Cam v4: wait for $29.99 or below. Normal street price is $35.99.
- Tapo D230S1 doorbell: wait for $59.99 or below. Normal street price is $69.99.
- Blink Mini 2: wait for $24.99 or below. Normal street price is $29.99.
How the event actually moves prices
Past U.S. Prime events follow a reliable shape. Flagship robot vacuums get the deepest percentage cuts (25-40%), and they sell out first – the Qrevo and X-series deep cuts in previous years were gone within the first few hours. Amazon’s own brands (Ring, Blink) discount early and stay discounted all two days. Third-party smart home brands stage their cuts in rotations: day one morning, noon PT refresh, and a final Sunday push. The noon PT rotation is where relisted deep cuts live.
Across Chinese owner communities
In Xiaohongshu and overseas-shopping threads this week, the recurring warning is about “降价幻觉” (discount illusion): models that simply match their normal street price are being labeled as deals. Shoppers there keep a shared price-history note, exactly the floor list above, and refuse any price above it. The second piece of shared advice: for flagship robot vacuums, if the floor is reached on day one, do not wait for a lower price – the inventory does not last.
The honest catch
Floor prices are directionally reliable, not guaranteed. A model can miss its floor if Amazon allocates inventory differently, and bundles can muddy the math: a “deal” that bundles the robot with full-price consumables may not actually hit the floor on the robot alone. Two more rules: check that the deal price is on the model you want (the same family has cheaper trims that look identical), and remember that accessories like dust bags and mop pads drop separately – the best accessory prices often come on day two, after the robot stock is gone.
Bottom line
Four days out, the plan is set: keep the floor list, screenshot today’s prices, and be ready for the opening window on October 6. The deepest robot vacuum cuts arrive first and sell out first – hit your floor on day one, and treat anything above the floor as a maybe, not a must-buy. If a target never reaches its floor, the event is not a loss; every model on this list has shown its floor price within the last three months, and the next window is only weeks away.
Sources
- Amazon U.S. product listings and 30-day price history for the models above (September-October 2026)
- HomeTechBench previous PBD coverage: watch list, stacking guide, price-tier guide, membership guide
- Owner community threads: 什么值得买 / Xiaohongshu / Douyin discussions