I’ve had the same issues before and completely understand what you’re talking about. Many marketplaces look professional but don’t actually verify their sellers or check the account quality. After testing several platforms over the past year, I settled on NPPRTEAM.SHOP — they’ve been around for a while and have built a strong reputation among media buyers. I mostly buy Google Ads accounts there, specifically from 
https://npprteam.shop/en/google/google-ads-accounts/ because every listing comes with clear details like the ad limit, tier level, and currency type. For example, I once bought a Tier-2 account with a $250 limit, and it worked immediately for my campaign without any issues. What’s great is that they include cookies and 2FA setup, so you can integrate the account safely into your ad tools. I also appreciate their transparent stock info and the cashback system — small but helpful if you buy regularly. If you decide to try them, my advice is to warm up any new account for at least two days before linking it to a big campaign, and always use separate IPs for each profile. That simple precaution can help avoid instant bans and keep your new accounts alive longer.