How can I get bulk cards for fairly cheap?

So I am getting back into the hobby of Pokemon collecting and am looking for where I can get bulk cards. I know they aren't favorable but I also know that I don't have much money to afford fancier cards because I am not even 18 yet. I just kind of like seeing all of the cool artworks and seeing all the cards of my favorite Pokemon. If you have any advice or information, it all would help. I'm not even sure how much I should be spending for bulk cards.