AngularJS expert, quick filtering dropdowns functionality

General information for the website: JS app
Num. of web pages/modules: 1
Description of every page/module: The filtering dropdowns functionality would take a JSON string and output the last selected item in the nested arrays.
The search option will only return the string entered.
Description of requirements/features: Hi,
I need to develop a simple angularJS filtering dropdowns functionality.

The input is nested arrays formed into a JSON string
----------
- Cannon
-- ink
-- laser
- HP
-- ink
--- HP Colour Copier 100
--- HP Colour Copier 110
-- laser
- Epson
----------

What I need is to load the level 1 items into the first dropdown and upon the selection load the corresponding values to the 2nd dropdown etc.
Each item has couple of attributes, url being one of them.
The final output is the url of the final selected item.

Please start you offers with "PRINTERS SPEC READ" so that I can see you took those 5 minutes to really read this spec, otherwise I won't bother to reply either.

- The number of dropdowns will be static and be set to 3
- Only the first dropdown will be enabled on start
- There is also a Search button down below which will return just the string entered into the field


The final app can be delivered in Plunker, here is the starting point:
http://plnkr.co/edit/yWAuRJHKGpYLNHIHEkQs

And here is a working example of what exactly I want to achieve:
cartridgesave(dot)co(dot)uk


Thanks
Zbynek
Extra notes: