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The ARMR blog

Plain talk about growing on marketplaces.

Practical notes from running Amazon and Walmart accounts every day. No hacks, no hype, just what actually moves revenue.

Prime Big Deal Days 2026 was Amazon's best fall sale yet - what the data means for brands
Amazon • 6 min read

Prime Big Deal Days 2026 was Amazon's best fall sale yet - what the data means for brands

Amazon's October 6-7 sale set an October record, and the cross-shopping data shows how many customers checked Walmart at the same time.

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Amazon Listing Automation: When to Build vs. Buy Software
Technology

Amazon Listing Automation: When to Build vs. Buy Software

Off-the-shelf listing tools vs. a custom build - the catalog size, update frequency, and compliance signals that decide it for marketplace brands.

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Amazon adds LTL freight labels to Buy Shipping - what it means for bulky-item brands
Amazon

Amazon adds LTL freight labels to Buy Shipping - what it means for bulky-item brands

Amazon is rolling LTL freight labels into Buy Shipping this October, bringing negotiated rates and late-delivery protection to bulky and oversized shipments.

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Building a Custom Inventory Management System for Marketplace Brands
Technology

Building a Custom Inventory Management System for Marketplace Brands

Build vs. buy: what it actually takes to build a custom inventory system that keeps Amazon and Walmart in sync without overselling.

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Amazon's 2026 peak fulfillment surcharge takes effect October 15 - what it costs by size tier
Amazon

Amazon's 2026 peak fulfillment surcharge takes effect October 15 - what it costs by size tier

The headline $0.32 average hides a much wider spread by size tier, and it stacks on the existing fuel surcharge.

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How to Integrate Your ERP with Amazon Seller Central API
Technology

How to Integrate Your ERP with Amazon Seller Central API

Connect your ERP to Amazon Seller Central the right way: SP-API setup, data mapping, sync testing, and the mistakes that cause oversells.

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How the Amazon Buy Box actually gets won (and quietly lost)
Amazon

How the Amazon Buy Box actually gets won (and quietly lost)

The Buy Box decides most of your Amazon sales. Here is what really moves it and how brands lose it without noticing.

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ACOS vs TACOS: the number your Amazon ads should answer to
Advertising

ACOS vs TACOS: the number your Amazon ads should answer to

ACOS tells you about a campaign. TACOS tells you about the business. Here is how to use both without fooling yourself.

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Launching on Walmart Marketplace without breaking your Amazon rhythm
Walmart

Launching on Walmart Marketplace without breaking your Amazon rhythm

Walmart is the fastest-growing second channel for many brands. Here is how to add it without draining your team.

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Listing SEO that converts, not just ranks
Creative

Listing SEO that converts, not just ranks

Ranking for a keyword is worthless if the page does not sell. Here is how to write listings that do both.

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