Gigabit Ethernet Interface (via Marvell 88E1111) with Cyclone IVE FPGA

When you compile the project, in the report go to Analysis & Synthesis > IP Cores Summary, and you will see a list of all the licensed IPs. That way you can see which ones you need.

You'll probably need at least the TSE core for Ethernet, the Nios CPU if you aren't using the /e version, and maybe a memory controller.

For the prices you should contact your local distributor for a proposal. In some cases they have packages with licenses for several IPs at a reduced price.