I got tired of fishing around for mine, too, so I got a medicine shelf to keep on my desktop. It looks like this empty(ish):
And like this with blocks and tools:
I gave it away when we moved, and I have a MISTI now, so I no longer use it, but it was wonderful when I did! You can find them a lot of different places (I found mine at a grocery store). Here's a link to it at walmart.com:
InterDesign Med Plus Drawer Caddy, 12", Clear
My blocks were from Close to My Heart, and weren't gridded (but they were well-loved, obviously), but they were great sizes and weights. I still have them and use a couple of sizes regularly (tiny ones, mostly).