Progressive Automations manufactures motion control products, and sells them with no minimum order quantities. If you're designing something for small-batch production, or a custom shop building a one-off, or a DIY'er looking to add automation to a project, you're pretty much their target market. They sell actuators, servos, relays, control systems, wiring, connectors, et cetera, and can also handle custom requests.

To give you an idea of what you can make with their stuff, they've got a YouTube playlist of customers' projects. Here are some examples:

A WiFi-controlled window, which would come in handy for those with grip or mobility issues:

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An automated set of trap doors:

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Bookcase hidden doors:

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A staircase that turns into a wheelchair ramp:

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A pickup truck with a bed-mounted wheelchair lift:

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This one's pretty weird, but as contractors know, clients want what clients want. This guy's wanted a first-class-airplane-bathroom-themed powder room.

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There are more customer project videos here, and you can browse the company's offerings here.