The Frugal Choice (Wedge Type): Hopkins
Lightweight and inexpensive.
The Frugal Choice (Tandem Type): Camco
Cheap and easy. You can click a button while ordering to get a security lock for it.
Your First Upgrade (Wedge Type): Ironton
More substantial and hefty.
Your First Upgrade: (Tandem Type): X-Chock
These are the most commonly used tandem type wheel chocks.
These are levelers and wheel chocks in one - very handy.
The Savvy Sweet Setup: (Wedge Type): Beech Lane
The Savvy Sweet Setup: (Tandem Type): Cynder
Steel like the X-Chock but comes with a ratcheting wrench and a padlock to deter theft.