Legos in bulk?

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I’m all about buying constructive toys for my kids (they’re 1 & 3 right now) since I think it fosters creativity and good thinking skills. Last year we bought them a ton of wooden train tracks that they love. They are both starting to get into Legos when they visit friends that have them. But Legos are so horribly expensive!

Does anyone have experience buying Legos in bulk (used) or even off-brand Legos? I’m considering something like this for an off-brand option.

I’m planning on building a table like this for my kids:

P.S. Here’s how awesome all of the train tracks look:

sup