All the main office dressing is still very easy to come by--office-supply stores, at least in North America, have nearly everything you see in the MC 'bullpen.' Pen cups, staplers, post-it note dispensers, in/out boxes, dry erase boards and affiliated magnets & pens: easy items to find.
Just a quick glance at this bullpen picture, and you can see the office is littered with heavy-duty staplers, hole punches, tape dispensers, pen cups, blotters--an office-suppliers dream!
If you want to have Major Crimes-related items in your home and spend virtually no money on TV props, and have the benefit of functionality, office supplies are the way to go!
You can find the 'pushpin' style magnets in several colors also. The MC detectives often are shown attaching photos via these plastic, colored versions. I prefer the simple silver above.
Here's Andy showing us a size comparison. They are the 'jumbo' sized magnets:
And Andy again (so helpful!) with an Expo Dry Erase Marker:
Many of the desk & paper organizers are found at Staples Office supply:
...and you can also find all the variety of upright file holders/organizers too. They've been used liberally on set for several seasons--and are still available in stores.
Sharon's office has the pen cup, wire baskets, Post-It Notes dispenser--but also a suite of office organizers unique to her space. "Semikolon" is the brand that makes all her upright magazine/file holders and all the cream-colored boxes in her office, as well as the 'in-box' on her desk. I've found the Semikolon line at The Container Store. The caveat here is that this line frequently changes colorways.
Armed with the above, go forth and spend very little to have a well-organized home office or study area, and you can secretly know you're surrounded by the everyday work-tools of the Major Crimes gang!
Now, who moved my stapler?!