I have used aclepsa.com for many years since the costs for my drugs are less than my co-pay (I am not entitled to Medicare, yet).
Check this out:
Pharmnet Lotrel (generic)
Aclepsa Lotrel (generic)
I have not had any quality issues with Aclepsa - my doctor knows about the drugs and my labs and other tests are good. The only problem with Aclepsa is that you need to order about 60 days out.
Just an FYI.