There are several affordable options for housing an Australian Shepherd dog, including:

1. Outdoor Kennel: An outdoor kennel provides a secure and safe space for your dog to play and exercise. It can be made of a variety of materials, including metal, wood, or plastic, and can range in size from small to large. A kennel should have a roof to protect your dog from the elements, and it should be large enough to allow them to stand up, turn around, and stretch comfortably.
2. Indoor Crate: A crate can be used as a comfortable and secure indoor sleeping area for your Australian Shepherd. It should be large enough for your dog to stand up, turn around, and stretch, but not so large that they have room to use one end as a bathroom and the other as a sleeping area.
3. Dog House: A dog house can provide your Australian Shepherd with a cozy and protected outdoor sleeping area. Dog houses come in a range of sizes, materials, and designs, and can be made from wood, plastic, or other materials. Look for a dog house that is elevated off the ground to keep your dog dry and protected from the elements.
4. Outdoor Dog Run: An outdoor dog run is a fenced-in area that allows your dog to exercise and play outside without being confined to a small kennel. It should be large enough for your dog to run and play, and it should have a secure gate to prevent escape.
5. Room in Your Home: If you have the space, allowing your Australian Shepherd to sleep inside your home can be a comfortable and convenient option. A designated room or area of your home can be made into a cozy sleeping space for your dog, complete with a bed, toys, and other comforts.

When choosing a housing option for your Australian Shepherd, it is important to consider factors such as size, security, protection from the elements, and accessibility. No matter which option you choose, be sure to provide your dog with plenty of love, attention, and exercise to keep them happy and healthy.