I don't do bonds, so I don't have an example to give you. I do stocks, but if you ask me how much shares of JCP (JC Penny) is going to fluctuate between now and February of 2018, the answer is still going to be, "Impossible to say".

The daily price of a bond will fluctuate based on many things. Some examples are credit upgrades/downgrades, stock prices, corporate events (bankruptcies, restructurings, mergers, buyouts, etc), inflation/deflation, liquidity, bid/ask spreads, and the Fed's interest rates. But if you plan on holding the bond until maturity, then none of this really means a damn thing. Unless Walmart goes bankrupt and defaults on the bond, then at maturity you should get back 100 of your principal, plus you'll have whatever interest you collected over the 5 years.