I'm surprised no one has mentioned the best cream in the world ever! It's available again, it is pricey and it is te best - Xpec. They charge the same for the Original and the unscented.
You won't be surprised if I bang on yet again about the most important ingredient in all lathers whether from soaps or creams - soft water. A few drops of bubble bath in your shave water should do the trick - just enough to get a few short-lived bubbles when you whisk the water with your fingers.
Are the expensive ones worth it? If you can afford them and enjoy being generous to yourself - absolutely yes.
