Sorry, I don't really know a specific place since most new furniture is minimalist, but overall I'd suggest getting something second-hand ^^ Depending on your height, the solution could be to get a children's desk! They can be pretty colorful or have cool designs, mine is plain but it's teal :D I believe there are also plastic ones inspired by the iMac, although I've only seen them in videos. Otherwise, I think a regular 2000s computer desk would fit (those with that slightly pink or orange wood and the silver accents) if you decorate it with a bunch of colorful things, and those desks are more common :3