Styrofoam Cups En Masse

[Bitwise Gamgee]

Last year was the first time I started my own tomato seeds. ... so, I'm still looking to optimize . For the first (and only) potting up I used styrofoam cups. I really like the fact that they don't dry out too fast, they are readily available, cheap, and you can inscribe the name in them. However, handling them, I found to be quite unwieldy . I need a container which is 1) easy to move around 2) I can leave the cups in when watering, 3) will hold plenty of cups, and 4) will keep them all upright.

I need some ideas ... what do you use

Thanks,
Bitwise