If you are looking for odds and ends to cable, fix or mount things in your house, your local hardware store will have everything you need. Whether you want to buy drawer rollers to help your drawer slide in and out easily, or get a conduit to cover electrical wiring you might be installing in your house, a sales person at one of these stores will be able to point you in the right direction. You could also head to local stores like Home Depot or Lowes, but a hardware specific store might be your best bet.
Along with the conduit, you will be able to find other items for electrical wiring like threaded standoffs which help separate different pieces to protect the equipment from electrical shortages. Other items that might be of interest to you if you are wiring are cable glands that help with wire management. Otherwise known as connectors, they are used to secure and attach cabling to equipment. These glands used to be made of brass, but are now usually found in aluminum or plastic. If you are asking advice from a sales professional at the store, they might also recommend that you use pvc pipes to protect your wires and cables from damage. Wires can be pulled in from outside using these pipes, and closed off on both ends using pvc plugs. These pvc plugs seal off the ends of the pipe and prevent dirt and water from seeping through to your cabling. All of these things can be secured with plastic screws since they can be used with many different types of materials. It will also match the plastic look from the pvc pipes, the cable glands, and a plastic standoff.
Hardware stores will have all the parts that you need for your project. If they do not, you can always ask to see their catalogue and order the parts. You can also look online to search for the product you want from several online hardware stores. You might end up finding a better version of the item, and a better deal.