You can buy a regular binder and some felt for pages and just punch holes in the felt to fit the binder.
I did that for many years but I used the sturdy felt that is thick as cardboard and doesn't bend with the weight of the pins.
I also bought some of the plastic card holders that hold 12 cards on a page. Cut out some felt to inside the holder (use a baseball card as a template) and put the pin on the felt and the felt inside the card holder. This works great to protect the pins and keep them safe.
If you want to travel with your pins try and find a binder that has a zipper around it. That way if the pin comes off the rubber backing you won't lose it.
If you are keeping your pins at home why not display them instead of putting them into a binder?
I bought a few large corkboards at
Walmart and painted the cork with acrylic paint. Then arrange your pins on the corkboard and show them off.
You can do the boring cork color on your corkboard or decorate the board to match your pins. I have a flag painted on the board where I have my patriotic pins, I painted a purple border on the pink background of my Figment pins. etc... My Mickey pins are all on a black background since they look better on that color. I did try red, yellow and white but went back to black. Enjoy pins, they were so much fun when I was collecting and I made some great friends because of pin collecting.