I have a couple of display cases I bought off ebay for a decent price - metal with glass windows. Then I bought plastic tubes to store the rest - pretty inexpensive protection. I took a nice wood silverware box, ripped out the middle piece that held the silverware in place (which was just lightly glued on top of the bottom fabric liner and there you have it - a really nice pen box! I bought some inexpensive pen cases (not real leather) off ebay, but I worry that the elastic, over time, may mark or dull some of the plastics. Maybe just paranoid. I've also found some nice cigar boxes with dividers. Would be great with the pen tubes to take 6-8 pens or so at a time.
Good luck!