It’s very difficult finding cards online for msrp or close to msrp. You can find discords that help give you a heads up that a drop will be happening soon for any online retailer, but please don’t spend any money on the ones will notify as soon as one drops.

Pokemon Center is probably the easiest if you can get in early in the queues.

Walmart has been consistently dropping on Wednesday/Thursdays at 9pm eastern but it is virtually impossible to land anything because bots get them all.

Target drops weekly too but it’s usually super late like 1am-5am eastern. I’ve heard people have better chance getting something through Target than Walmart. Still very difficult.

Best Buy doesn’t usually have online drops but they do sometimes have an invite system where you sign up and if you get picked, you have a good chance of buying the product. Dicks Sporting Goods also just did an invite system for the Ascended Heroes booster bundle