Route48
Route48 is a free service that provides PA IPv6 address space, to anyone signing up with a valid reason. You must sign up with your real name and email or you will be banned. You can obtain up to 5 /44s of IPv6 address space, and you can ask for more provided you have a valid reason for it. You can sign up here!
Route48 also has a discord server which you can join by going to this link!
Tunneling services are also provided, with many locations also allowing BGP sessions from your own ASN.