Thanks for the post.
LBBB is found in a certain minority of otherwise healthy persons. From military cadet data, the estimate is somewhere on the order of 1 per 10,000. In these studies of predominantly healthy young men, if a person had no other signs of heart disease, then the finding of a LBBB had little to no adverse prognostic significance.
No one is exactly certain what type of work-up is required for an otherwise healthy person who is found to have a LBBB. In the modern, litigious American health care system, many doctors would indeed order a stress test and echo, but there is no guideline dictating that this has to be done. Someone without insurance would likely be monitored by some doctors to avoid the out-of-pocket expense.
Talk to your doctor, and explain the situation to see how strongly he/she feels about the testing.