For a simple upstairs-office fix, I’d look at a 2-pack rather than buying an expensive Wi-Fi 7 system.
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Walmart — TP-Link Deco W6000 2-pack: $109. It covers up to 5,000 sq. ft. and is a straightforward Wi-Fi 6 mesh setup.
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TP-Link Deco W6000 2-pack - $109.00 (Walmart)
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Newegg — TP-Link Deco X55 2-pack: $149.99. A step up to AX3000 Wi-Fi 6, with up to 4,500 sq. ft. coverage and three Ethernet ports per unit.
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TP-Link Deco X55 2-pack - $149.99 (Newegg)
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Target — TP-Link Deco X10 3-pack: $139.99. More nodes can be useful in a multi-story house, and the Deco app handles setup.
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TP-Link Deco X10 3-pack - $139.99 (Target)
My practical pick
Walmart at $109 is the lowest current retailer price I found among the simple mesh options, while Newegg's X55 2-pack gives you more performance and Ethernet flexibility for about $41 more. Current deal data also shows the X55 has recently been discounted to around $150 at Amazon, so prices are moving around.
For an upstairs office, put the second node roughly halfway between your main router and the office, rather than directly inside the weak-signal room. That gives the mesh a stronger connection back to the router.
If you tell me your internet speed and approximate house size, I can narrow this to the cheapest system that should comfortably handle your office.