Tarla's Shop of Mystery is located atop Terror Mountain. You can buy something from her shop every minute and a half. You buy a mystery bag which gives you a random item. Some are good but some are horrible. Here is a list of all the items you can receive.
 Bad Seed |  Balloons |  Bit of Barbed Wire |  Black Osiris Plate |
 Broken Blue Fuzzle |  Broken Corn Pyramid |  Broken Fake Uni Hat |  Fir |
 Flipperbot |  Halloween Blumaroo Gnome |  Halloween Kau Plushie |  Iced Ceiling Fan |
 Melvie |  Neggitus Injection |  Packet of Gravel |  Pile of Dung |
 Punchbag Bob Plushie |  Quiggle Scout Stamp |  Rainbow Gun |  Rainbow Rug |
 Red Kazoo |  Round Rainbow Rug |  Sandstone Boots |  Skelly |
 Sphinx Links |  Stone and Slime Slushie |  Stylishly Simple Pond |  Ultra Icy Negg |
 White Mallard |  Whole Blackberry Pizza |  Wormy Slushie |  You Did It Card |
Boween Fire Paw Icy Desk Pretty Bouquet
Red Blush Speckled Uniocto
Paint Brush