Hi David,
If you are looking for the *lowest* rates, the Altrua Ruby plan has very low monthly contribution rates, but it is a more limited plan. Jericho Share also has very good pricing on its high deductible catastrophic programs.
Two of the most popular plans are OneShare, and Prosper. They are more expensive monthly than the two plans listed above, but have more complete programs.
The HSA Secure is priced very well, and is also HSA qualified.
But it all depends on what you are looking for.
Best,
Wiley