Your ARIN link is broken.
It's basically $275/year to have an AS and some PA assignment with no intermediary LIR. In Europe, you have to pay €1800/year without an ASN included. Each resource is billed separately. If you go with a middleman (another LIR) you usually have to pay 200€+ (with taxes) for 2 resources (ASN and PI space)
A PA block is just part of a LIR's block that they give you permission to use, so I doubt you could keep that if they went out of business, but maybe RIPE has a procedure for it.