The Corner Rounder can be purchased from Talas -- http://www.talasonline.com/
The white tape, somewhat sticky with square holes is called Fiba tape and is for sheet rocking and can be found at the hardware store.
The rust colored loosely woven ribbon (huge spool) came from Daiso, which has a store in Japan Center, San Francisco.
Bingo Daubers from Discount School Supply - online
The Duck Tape that Jami used to cover the bottom of her canvas bag (from Harbor Freight) comes from Target in the section where they sell velcro.