If you buy a EOS M3 between April and July you can claim a electronic viewfinder or EF lens mount adapter, by registering for a My Canon account on their website and then scanning/mailing a copy of your receipt to Canon.
They only have 500 of each device (EVF-DC1 or EF Mount adapter) and you can only choose one. If you have a my Canon account you can check how many left (409 of the EVF, and 482 of the Adapter as of writing).
For those interested JB HIFI still has the EOS M for sale at $199 and it comes with the adaptor :D
https://www.jbhifi.com.au/cameras/dslr/canon/canon-eos-m-18m…
Even though it says body only I can confirm it ships with the EF adaptor, but I guess there could be a chance it doesn't so gamble away