AR670-1 is the Army standard, the boot memo from West Point just explained the main parts from it that pertain to the boots. As long as your boots are labeled AR670-1 compliant, you're good. My son wore "Garmont T8 Bifada w ortholite insoles" to Beast, heavier boots but he didn't get any blisters. After A-Day, I brought him the lighter "Garmont T8 Falcon" which he's still wearing right now. He said he also got standard issue boots, keeping it as a backup just in case, but so far unworn.
We bought from uspatriot.com, they also have actual stores inside some base exchanges. We also visited there so my son can try on different brands and styles. He said the boots he picked seemed like his running shoes in comfort and support but heavier. The heaviness he got used to and didn't notice afterwards. Pick whichever compliant boots fit well.
Base exchange locations, find one close to you and hours open. Call first to ask if they have your size before going.
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If u don't have a military sponsor, you need the West Point boot memo which gives permission to buy shoes from base exchanges. Bring that and the WP appointment certificate (plus your ID) to the base gate pass issuer. You need to show it again to the cashier when you pay. You are permitted to buy black low quarters, boots, running shoes from the exchange.
All the best to the 2027 Cadet Candidates (CC)!