Understand that wallmart has cheap strips.
With an A1C of 6.9 on insulin I'd say you should do all you can to stay on it.
You could also look up the following books (please get the latest editions only) which can be very helpful for you to self manage your own diabetes with what input you can get from your dr.
Using Insulin - John Walsh
Diabetes Solutions - Dr. Richard Bernstein
Think Like a Pancreas
Hi if your doctor writes a prescription some insurance companies will pay. Mind does and I have a co pay.
Then you could also try looking up the test strip that you use to see if the company offers a discount card to help pay.
Good luck
Have you Google'd your unknown test strips with the keyword free? Contacted the mfg? Google'd free clinics in your area? Asked your local hospital? BTW, quite unusual for an A1c of 6.9% [151 mg/dl eAG] to require insulin when an oral medication can do the same.