Several regions under one agreement is doable, that’s how we set it up. We source our IPv4 addresses through InterLIR Global, they’re registered with RIPE NCC, ARIN, APNIC, LACNIC and AFRINIC, and one agreement covers transfers and leases across all of them. The marketplace shows available blocks in real time with RIR and geo, so you can see what’s actually in stock for the US and Asia. For budgeting, their public table currently shows leases at roughly 0.38 to 0.72 euros per IP per month for a /24, and from 0.35 for larger /22 blocks. They also offer BYOIP for cloud, worth asking about if you run on AWS or Google Cloud. Sales questions get answered within one business day. Prices move, so get a fresh quote right before budget sign-off.