A lot of the plans, especially from David W/rxexplorer's site, but also on FliteTest (where he posted the DIY Tricopter video) feature frames you can build yourself with just access to home improvement/hardware stores and "basic" hobby parts (motors, esc's, flight controllers, rx/tx you generally won't find in a home goods store).
If you're looking to buy parts from local stores, the difficulty might be finding a store that sells components. Nevertheless, all the hobby stores near me offer to order parts for you even if they don't stock it as long as you specify what part(s) you're looking for. Also, you may find you can 3D print parts in local places. There are more and more of those popping up. RC Explorer/DavidW has the gcode for his tilt mechanism posted, but you can also build his old tilt assembly using landing gear components you can order/buy from hobby shops.