Best Costco deals to compete with Amazon Prime Day 2025: Top sales this October

Amazon Prime Day is tomorrow, but you can find great deals at Costco right now.

October Prime Day (also known as Prime Big Deal Days) starts tomorrow, but Amazon won't be the only place to find discounts. Costco is again running a Member Savings Days event all week, with competing deals on tech, appliances, home essentials, and more.

Also: The best October Prime Day deals live now

Costco is a membership-based wholesale retailer. While non-members can shop with a guest account online, only members can access the full savings for the store's sales events (non-members can expect a 5% markup on purchases, and some deals are members-only). Memberships start at $65 a year (and you can sometimes find membership deals through third-party sites).

I'm a commerce editor and, personally, a major Costco fan. I'll help you search through the sales and find the best deals possible ...