Since I am still quite poor in terms of financial freedom, I am unable to purchase a kendo practice dummy for my personal use at home. Though, if I had the money, I would probably still not purchase it for the lack of proper space and storage...
So, I present to you, the urban poor man's Kendo Dummy.
What you need is:
1) 30x375mL Coca-Cola Can box, in as mint condition as possible, preferably with cans removed.
2) Two standard size cereal boxes, preferably with cereal removed.
3) Packing tape, the fat width kind, or Duct/Gaff tape if you have it for maximum grip.
4) A paving brick or heavyish object that will fit inside a standard cereal box flat.
5) A milk crate of some description.
6) A Bankstown City Council General Waster Wheelie Bin. This may be substituted with your own local council bin, or other object of the appropriate height. If your bins are higher or lower, then you may need to find appropriately sized cardboard boxes and/or remove the use of the crate as required.
Stick the boxes together like so in the picture below. Insert the paving brick for weight and stability purposes. Your base unit is ready to roll. Click on the image for the full size if you need to read the green text.

For me, having the base unit on top of the wheelie bin was too low for my own men cut height, though it was suitable to represent some of the shorter persons in our club. I found by adding the milk crate, the height was perfect for me.
By turning the base unit sideways without the crate, the Coca-Cola box was a natural height for a kote cut, and having the paving brick in the other box which was not being hit meant that I ran no risk of damaging the shinai. Just ensure the weighted box is firmly on the wheelie bin lid.

The use of this practical and cheap Kendo dummy is that when you make the cut, you can practice your power and tenouchi. As the cut lands, it will collapse the boxes in slightly and you can see how deep your cut is, and how effective/controlled your tenouchi is. If you have poor control and tenouchi, your cut will crumple the boxes quite severely, where as if you do not have enough power and depth of cut, you will not crumple the boxes enough. If you feel inclined, you can draw a men on the box to see how far your cut goes.
The cardboard from the Coca-Cola box is slightly reinforced to take the weight of the cans, so it can stand a bit of punishment, while the other boxes can also be easy pushed back into shape or replaced when needs be. Store the base unit out of wet conditions for best use life. You can use this to practice your basic suburi without straight forward zanshin movement, as well as basic hiki-waza practice. Once I figure out how to attach a dou cut segment, I'll be sure to let you all know.
I know it looks very ghetto, but it seems to be effective, and your cuts will make noise on box contact. Soft cuts are not as loud sounding as hard cuts. Oh, and you will have to judge maai from not shinai distances but actual body distance, which I think is also quite useful.