where can i get a coach or juicy couture phone cover or case for my samsung comeback?

nfortunately there is neither a Coach nor Juicy Couture case or cover for your particular phone!  There are generic covers though that you can buy.  Only Comback has a few cases for your phone.  One is the Cobalt Blue cover selling for $8.99
specifics:
Features & Specifications: → Hard plastic protects your cell phone from scratches and dents → Easy, Snap On installation requiring no disassembly of original phone cover. → The two-piece protector case snaps securely onto the front and back of your phone.



There is also the Spring Flowers cover selling for $9.99
specifics:
Our covers are specifically designed to perfectly fit your Samsung Comeback T559. This protector case consists of a front and rear cover that perfectly fits your cell phone. The easy, snap-on installation ensures that you will have no need to disassemble your original case. This cell phone case has the same cut outs as your original and will not hinder functionality. Whether you need to protect your phone or personalize it our store can fullfil your needs.