$50 for a pocket square at a Marshalls? Even the better of the two Marshalls stores I go to usually only has ties for up to $16.99 (that's for the Brooks Brothers seconds). I don't know if either of them even stocks pocket squares.
And if you do find them, they don't seem to ever be marked down. There are a couple RLPL pocket squares at my local TJ's that have been sitting there at $49.99 for six months. That being said, Spoo found an E. Marinella tie marked down to $39 at one of those discount stores, so YMMV.