I wanted to post about sample cases.

Usually neon shops will have fliers or posters of neon samples from a variety of brands such as Voltarc, EGL, or Tecnolux. Sometimes they'll even have their own that they made for customers to check out when they stop by the studio. Or you could even order one from said companies back in the day. One reason that it's a good idea to make your own is because, as we know, true color matching gets lost in print when it comes to light. Most of the color charts are close but not an exact match to, say even matching for repairs (especially whites). I have met some benders in the past that were required to make their own sample case as a part of their coursework when neon schools were around before they receive their certificate. Yes, there were certificates for neon benders. 

Here are some from those companies mentioned: 

I believe this is a great way to bring back the neon sales person sample case and really make it your own. Every case is different and every color can be customized and designed however you wish to display it. Whether it's the colors you choose, how many colors, and even the shape of the glass. it also gives the client a WOW factor if you bring it with you to your next meeting. 

You can create a diagram and print it out to keep with the case to show what colors are included or even print labels right on or near the tubes. If you have color charts as well, that can be helpful to keep in the case with your samples because there are far too many colors to fit into one case alone (or are there?)

I used my grandfathers old Samsonite suitecases to make both of mine out of respect to the craftsman in him: