You may be able to purchase a vehicle in Mexico but it CAN NOT be registered in your name unless you have a Temporale or Permanente visa and a CURP number. The plates generally stay with the vehicle. This relates to Playa del Carmen but it explains it the requirements - https://mexlaw.ca/foreigners-registering-vehicle-mexico/
There are a couple of people from GDL that come and sell cbd oil lakeside. Might be an idea to contact them. Need to join FB as that is where the post when they will be in the area.
Contact Michael Merryman at Ajijic Electronics or there is a place in GDL (but can't remember the name atm). Read the threads here and TOB on Shaw service. Shaw seems to be clamping down on out of Canada service.
Oh and you posted this request a number of times so you might want to delete the others.
The office at Chapala Haciendas had some stun guns for sale; if you are interested Tel.- 376-765-4045
They were either 450 or 500 pesos and came in different colors. Don't know if he has any left.
You should join this facebook group https://www.facebook.com/groups/MEXPAT.LAKE.CHAPALA/?ref=bookmarks
Also search within this web board (i.e. Nogales), there has been lots of questions addressing where to stay, driving directions, etc.
in the little strip mall couple doors towards Chapala from Mom's deli but before Maskaras clinic and the Sucrasal (?) lab; Dental Health One 376-106-0826