I built one out of an old 5 gallon propane tank. Works great and is very easy to build (if you have access to welding equipment)

I use an A/C evacuation pump as the vacuum source, takes about 2 minutes to suck out the old oil.

If you try to make a topsider make sure the container you use can handle a vacuum. My first two attempts (using a Jerry can and a 5 gallon water jug) ended in implosions. Any container that is rated for pressure will be able to handle a vacuum.

Of course you can buy a nice topsider for $50 - If you value your time buying one is the way to go.

Tim