benji101:
go to RD, R, HD, CT... electrical department, wiring on rack rolls at the back of the stores, they will cut you the length you need...get the 10-3 orange shielded wire... 10 gauge, 3 single wires inside (black, red, white, plus the ground) - strip out and use the 3 color shielded wires, and don't use the ground (bare) wire it's thinner...
By the way, I don't know if you noticed this yet, but service over the phone is at best risky, and inconsistent! Go in person and search, sometimes the store employees are learning about their products along with you...that's normal today...
You won't find 6 gauge, or 8 gauge I think either, other than in braided (strand) format - don't use this
They also have the black PVC, grey schedule 40, EMT, and galvanized piping (electrical, plumbing departments) - any of this piping will bend past 3 ft unbraced lengths. You can also go to the hardware aisle at the end, standing in slots, for various 3, 4, 6 ft lengths of metals in all forms and types of metal (angles, tubes, flats...)
For the hardware, go to the hardware aisle, they have bolts, screws, washers, angles, plates, brackets up to 12", etc - all types of steel (zinc plate, brass, galvanized...)
Other useful aisles are the the finishing moldings, they have all type of wood molding, but also metal (aluminum) moldings
For the reflector they sell small rolls of galvanized fence meshing, at the back wall, near the cement / fencing materials. the smallest quantity comes with 1"x1" openings, 3x5' ft roll I believe. Anything smaller is too flimsy, anything larger is heavier gauge and large expensive rolls. I finally found some heavier gauge 1"x1", sold by the length, at RONA on St-Jacques..
For antenna masting and mast mounts, a useful aisle is the shelving aisle at the end of the store, they sell long angle brackets (12 - 20"). Also a metal yard, such as AL in Lachine, will have all kind of piping for half the price...
hope this gets you started..