I bought my Proclick P50 from Amazon and my spines and covers through mybinding.com. I was able to get my navy 1/2 inch spines (holds 100 sheets of paper) for $10 per 100 earlier this year…so I made the jump to proclick. Now that I have been using it for everything, I think the regular priced spines ($30-50) would be worth it now too. Remember that these spines open allowing you to add pages to notebooks and to reuse the spines. The proclick punch works with 3:1 pitch spiral coil spines as well. Basically, it punches about 4-6 sheets at a time and then you manually insert the spines. A zipper tool to open and close the proclick spines comes in a box of spines.
I buy card stock through Costco to bind together for our nature notebooks.
We use our proclick notebooks like a workbox system. Every subject gets a notebook. I can fit four cardboard magazine files (for storing the notebooks upright) in a large cardboard storage file box to make the children’s school boxes. As the children complete notebooks, I plan on storing them in file boxes out of the way (garage). We use binders rarely now which has saved us from crowded bookshelves.