When looking for Urns for Pets don't discard the marble urns because you think that they are expensive.

Our collection of marble pet urns are beautifully handcrafted from solid natural marble, offering distinct veining patterns and a unique beauty which cannot be duplicated with man-made cultured marble. They are unique as your pet were.

Besides, our marble Urns for Pets are very affordable and come with free shipping. 

The pet urns showed in that page is the Green Marble Pet Urn I

Here is the description:

Size: Large: 8" Capacity: 110 Cubic Inches, 0-125 lbs

Small: 5.25" Capacity: 35 Cubic Inches, 0-35 lbs