Where can I get the sticker?
There are mock-ups in many Zone System books. I sat down and cut chips off a printed step wedge. Then followed the layout in Minor White's booklet. You really don't "need" to precisely find the 10 actual print tones. Find any scrap print with some smooth tones that you can cut small chips that divide "visually" into 10 different values from black to white.
Lots of contributors to this thread will offer their favorites as your "go-to" answer, so here is mine. I have used Gossen products for over 20 years, either as a primary exposure resource or a backup or incident option. The nice part of the Gossen units I have used is the "system" aspect of buying accessories that fit newer and older models. I recently sourced a Gossen Luna-Pro F (F includes flash measurement) that uses a standard 9V battery (think smoke alarm) and can use the variable spot attachment from my earlier Luna-Pro/Luna-Six for extra versatility, and with the SBC advantages. You can meter in incident and reflected modes, the wireless flash option is there if you would ever need it (or the next owner), it is very accurate, and lots of cheaply sourced accessories are available on the net.
Over the last 90 days I have seen the Gossen Luna-Pro F series trade on eBay between the $40 and $60 dollar range in what appears to be good condition, and with the demise of analog the system attachments for extra functionality are going for cents on the $ in some cases. It is a good system approach to light metering that I have had luck with historically.
Do your homework, decide what is important to you related to features, and go forward. It has never been cheaper to pick up quality metering gear than it is today.
I agree with the Gossen recomendation. I have had LunaSix 3S and LunaPro F and both were very good. As already said, they are cheap to buy at the moment. I preferred LunaPro F as it has a zeroing scale and is easier to use. It also uses the easy to replace 9v cell. I am using a DigiPro F now which is more modern, digital readout and AA cell. It is an excellent meter which does incident, reflected and flash readings.
Thanks for all the suggestions everyone. I had a Gossen Luna-Pro SBC given to me the other day from a very charitable fellow. Everything seems to function, although I don't know if the readings are correct. He received it in a box of other gear he purchased years ago and never had a use for it. This should get me going quite nicely I think!
Congrats on your gift. I think the SBC has the same functionality as my F except for the built-in flash capability. All of the earlier model attachments work with it and I think it is a 9V battery also. If you don't have a manual you can find them online (or check the Gossen site), read up on the procedure for zeroing the needle and then test away!