Hello!
I'm in the UK, but I used the same search criteria I used here on Canadian Amazon.
The switch can be tricky to find, especially one with a long enough toggle/lever that's white (which is movie accurate). You might have to settle for a black one and paint it as I did. You only need 2 positions - 'on' and 'off' - so an SPDT will work fine. The important thing is the overall dimensions, since the space for it to fit into is tiny, and the toggle/lever being long enough to project through the aperture enough to be accessible.
The switch dimensions need to be around 8.5mm x 4mm x 4mm max. Try searching for an 'SS-12D07 micro vertical slide switch' and you should get quite a few results, although most will come from China.
Here's one result on amazon.ca. For safety, get one with the longest toggle - you can always trim it to length with side-cutters.
For an example, here's a pic of three of the switches I've used successfully (the white-toggled one is the most accurate but is a bit tricky to use in place as the handle is slightly too short).
View attachment 1731263
It did take a bit of searching but I did find some
5x5mm magnets from amazon.ca - item 11 in the dropdown if the link doesn't take you directly to that option. You can use 5mmx3mm, though, by filling the bottoms of the sockets with epoxy or similar. The important thing is that the exposed surfaces in both the should be ever so slightly proud and in contact with each other to carry power to the green LEDs.
Hope this helps and good luck with your build - the end results are fantastic!
