For running a node on a dedicated computer like a Raspberry Pi, it will cost about $300 for all of the necessary hardware but if you have an old laptop or desktop computer sitting around, you can probably run a pruned node on that.

For a brand-new user, I would suggest starting with Umbrel because their UI is the cleanest and their instructions are the best. They also have their own community forum with all sorts of topics that have been helpful to me personally. I use it all the time and I wish there were more dedicated forums for the different node implementations.

For someone with a little more experience, I would suggest using MyNode since they seem to have a bit more manual control like the ability to get into the command line and enter "/help" to get all of the different commands that you can enter. This can be an excellent learning experience for a new user who is going further down the rabbit hole.

For someone looking to run a lightning node, you can run a RaspiBlitz on the same hardware but their focus is to make it as easy as possible to route payments on the lightning network.

I wrote an article on this recently that might be helpful: https://www.whatisbitcoin.com/technical/how-to-run-a-bitcoin-node

I am working on some more technical node services that you can run but their hardware is a bit more difficult to come by and setting them up requires a bit of technical expertise or even getting into the command line. For instance, I am planning on running a dedicated BTCPay server on a Ras Pi but I need to get it all set up before I can really be sure of how useful it is as an actual node.