I remember back in the '70's we used to "make-our-own"...kind of.
We would use a high powered box fan; paint it, label it, even attach a freshener to the exhaust side. We also used these not only as stand up, but would mount the exhaust aiming at the floor mounting them on approx 4--8" high short chair legs. (You can also purchase round ones as well)
They always worked great in situations where required and we did not have to worry about them----if----someone stole them (never happened)
Thus, we doctored these box fans up very well and they looked professional and were very inexpensive.
The JAGUAR MX-2 ETM @ crossamericancorp.com