That’s fairly expensive to do just for a hobby interest, but at least the price has came down since I last looked.
Afterwards, announcing this space is probably the cheapest with vultr (but their BGP connectivity to VMs is uh, erratic at times) or with ix-vm.cloud, or with packet.net (more expensive). You can also try to colo something in he.net FMT2 and reach FCIX, or something in kleyrex in Germany. All in all, you should be able to do something like run a toy v6 anycast CDN at not more than $100 per month.
ARIN starting price is 2.5x that much (used to be 5x) for just the ASN. Glad the pricing is better elsewhere in the world at least!
If you're looking for PI (provider independent) resources from RIPE, the costs to the LIR (on top of their annual membership fees) is around 50€/year. An ASN and a /48 of IPv6 PI space would therefore clock in around 100€/year (which is in line with the GP's pricing).
Membership fees are around 1400€/year, with a 2000€ signup fee. The number of PA (provider assigned) resources you have has no bearing on your membership fee. If you only have a single /22 of IPv4 PA space (the maximum you can get as a new LIR today) or you have several /16s, it makes no difference to your membership fees (this wasn't always the case, the fee structure changes regularly).
(EDIT: Source: the RIPE website, and the invoices they've sent me for my LIR membership fees)
I feel like you ought to be part of the ffdn database: https://db.ffdn.org/
Though the "French Data Networks Federation" is a French organization, their db tries to cover every independent, nonprofit ISP in the world :)
> All subscribers to Internet access provided by the provider must be members of the provider and must have the corresponding rights, including the right to vote, within reasonable time and procedure.
Not all of our subscribers are members of our association. The association is primarily a hackerspace with hackerspace members being members of the association. We just happen to also be an ISP selling services commercially (eg. to people colocating equipment with us, or buying FTTH connectivity in the building we're located in).
