Welcome Michael!
If you are looking for just a mass amount of bricks for decent pricing, check out FB Marketplace and watch in your area for people getting rid of bulk Lego. Price varies bit average is usually 8-10 bucks a pound so if you can get several pounds for less (depends on piece type/size, etc) then you can pick up lots of pieces for a good deal.
Just be aware, a lot of times those have other bricks, like Megablocks and others, mixed in or other types of toys just thrown together so you may have to do some sorting but it’s a great way to get your brick count up to start with if you aren’t worried about specific sets.