From MDF to hinges, a veritable treasure trove for furniture makers! Finding a one-stop shop can be tricky. I remember when I was building that wonky bookshelf, sourcing the right screws felt like navigating a crazy hard game. It was like a Slope Game, so many options to dodge. Eventually I cobbled it together from three different places. Hope you have better luck! 
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Online's a rabbit hole of hinges. Remember that time I needed a specific screw for my kid's Slither io themed shelf? Finding that thing was like searching for a unicorn! Good luck with your wood project, hope you find all the bits! https://slitherio.onl

A complete one-stop shop, that's the holy grail. I've been there myself... Once, I tried to build a small bookshelf, only to realize halfway through that my screws were totally wrong, a real like Slither io level fail. I ended up spending three hours at the hardware store trying to find replacements, a truly frustrating experience! Good luck on your quest! https://slitherio.onl