I've created another short video going over what items I use on a regular basis in my Filofax. These items are use to create a washi tape color coding system. Take a few minutes to check it out.
Other than the Target page flags, which I couldn't seem to find online anywhere, the main products are linked in the description box of my video, and also at the bottom of this post. I hope you find some useful information in here!
Washi Tape: http://www.amazon.com/Mt-Washi-Masking-Tapes-Set/dp/B00DKI9816/ref=sr_1_1?s=office-products&ie=UTF8&qid=1413745759&sr=1-1&keywords=mt+washi+tape+set
Removable Adhesive (! These are the refills, so they don't come with the back on thme! ): http://www.amazon.com/Tombow-Mono-Removable-Adhesive-62209/dp/B00GU4Y45M/ref=sr_1_1?s=office-products&ie=UTF8&qid=1413745787&sr=1-1&keywords=tombow+removable+adhesive+tape+runner
Frixion Eraser: http://www.jetpens.com/Pilot-FriXion-Eraser-Light-Blue/pd/9096