Wittmer is cheaper (about $100 after initial lab work) and is used by many people here.
The issue with what you're doing is that it will be hard to find a doctor that will prescribe you an optimal dose at an optimal frequency even if you meet the requirement of being below the reference range.
You say you can choose your healthcare provider. If the option is available to you I think the best thing to do is to choose a plan that offers a HSA and then use the HSA to pay for the testosterone at a clinic of your choice.