Where can I find a Rockland 1-pc. Luggage - Multiple Blue Dot?

I really love this suitcase...but it's not JUST a suitcase. It's a set of luggage, with 4 pieces. So it's a little more money than I wanted to spend. And I don't even NEED 4 pieces of luggage to begin with. So where can I find just 1 Rockland-Mutiple blue dot suitcase? And since there are 4 pieces, you're probably wonddering which piece I want. I want to buy the biggest suitcase of the set. So thank you sooo much if you an find one for me.