[1] - Use .99, .97, or .95 instead of whole numbers. Use odd numbers. Example: 127.99 or 129.99 for your lowest plan.
.99 is for regular prices. .97 is for lowered prices (but still considered regular). .95 is for promotional prices. Special prices may include either, but are ruled by different pricing options.
Edit:
Don't take my word for it and test it.