As in most instances of this sort, regardless of the "Compare At" price, if you feel you are getting a good deal with the TJ Maxx price, then buy it. I've found that the compare price is usually double the TJ price. I just sort of ignore it.

In my experience, your first price tag is unusual in that the TJM price is not half of the compare price (compare at $20, pay $12.99). The suitcase is more typical of the TJM pricing where the TJM price is half the compare price.