Welcome Hempie
A couple of other options:
Take the soil from your paths to the bottom of your raised beds so you need less material. Another possible alternative is to start with lower beds and then increase the height over the years as you make/buy in more compost.
I don’t think the entire bed needs to be of compost, just the top few inches, so if you have a cheap nearby source of topsoil you could use that for the lower parts of the beds.
Good luck!
Jan