vacuum bleeder
 

Has anyone ever used a vacuum bleeder to change their oil? If so, where can I buy one?

It would be a tremendously slow process, the only direct route to the bottom of the oil pan is through the dipstick. By the time you fished a tube small enough to fit inside of it the diameter will be ridicuously small. I don't think aquarium air tubing would even fit.

If you do go that way plan on it taking an hour or better, depending on how cold/dirty your oil is.

Vacuum extraction tanks are available through most garage supply venues and sometimes Harbor Freight has them. Plan on $50-$225.