A small shop called "Adult Toys" which sells literal toys for adults.
The toys should have an addictive kick to them, giving them replay value which lasts for 100+ hours.

The toys would include:
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Perplexus- This set:
https://www.youtube.com/watch?v=QrkiJZKJfpY- Legos, K'NEX, Lego Mindstorms, and other DIY creative toys
- Magic tricks and magic kits
- Novelty musical instruments
- Pranks
- Math toys which show off only the coolest phenomena
- T-shirts with cool math or information science concepts visualized on them. Each t-shirt comes with a card describing the concept shown.
Kinda like ThinkGeek but it's instead strictly a toy shop. With a focus on the toys being as addictive as possible.
The toymakers, whoever they may be, are encouraged to use unique and hand crafted build processes for the toys. This is to leave a fresh spin on the design of the toys, adding quality.
The store also has a preference for handheld single-piece toys over kits. Kits lose parts easily and are hardly portable. Something handheld can be carried to work with you.
Additional toys:
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The Helix Cube puzzle-
Holonomy mazes with customizable peg placements
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Borromean hairpins, but closed off at the ends.
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These dice. I just like them too much. >~<
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Metmo cubes.
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TIES magic system.