How do I get more early access keys after I've used my 4 extra from support packs

Hi,

I've been slowly converting friends to play POE2 and handing out my keys. I now want to give some more keys to friends that are interested, do any of the other support packs have extra keys I can pass out?

If not, what's the best way. I don't mind handing out the keys that will be used with varying frequency but I've been using the points myself so I don't feel like they are a loss.

You would need to purchase extra copies of packs from the same series.

Repeatedly buying the $30 pack would probably make the most sense.