Here's where I got that filter. $36. I also have a coiled line (like $3 at HF) before and after the filter to gather moisture as the air flows up to the shoebox.
I also run a small on of these on my shoebox output. It also uses beads and a "tampon". The smaller volume (as compared to a filter the size of JoeB) does not add but a few minutes to the filling time.