There isn't a lot of selection for electronics in Halifax. Local options are: Jentronics, RAE Electronics and the Discovery Centre gift shop. But generally, most hobbyists buy from online sites like Aliexpress, Adafruit, or eBay. Online options typically take a lot longer, of course, but are cheaper and have a wider selection. Another option is to ask our Google Group. Typically, electronics hobbyists buy extras and tend to be generous with them. Often you'll be able to borrow a part from a local until an online part arrives.
Your best best for specialty wood is East Coast Specialty Hardwoods, Halifax Specialty Hardwoods, or Lee Valley for smaller projects.
Your best bets would be Piedmont, EM Plastics, or Sabic.
Your best best would be Fastenal or Trans-World.