These days there are lots of places to find unusual keyboards. Depending on where you’re located in the world, there are different easily-accessible hubs with competitive deals as well as smaller vendors, branching all the way down to private production runs of super small numbers and costing as much as a used car.
A few great places to start poking around:
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KBDFans - relatively large selection, ships anywhere, beginner friendly
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NovelKeys - when it’s in stock, they have a very solid entry board and all kinds of extra goodies
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MechanicalKeyboards - local to my neck of the concrete woods here in Tennessee, this is a great source for quality prebuilt boards as well as some custom accessories
If you want to see all kinds of fresh stuff, take a look at ghsear.ch - our own @ajoflo coded this up as a visually-pleasing and convenient way to check out group-buys and interest-checks posted to geekhack, another proflific, if less beginner-friendly forum.