I looked at the website and they offer the plug as an accessory, (go figure the plug to power the product is an "accessory -).
Anyway from what i can see it's a non-standard plug configuration, which means you prob can't borrow a plug from another device.
The unit is probably sealed, but take a look anyway on the casing for any casing screws to open it up so that you can hard wire it. Any 2 prong extesion cord (typical household 115V, 60 hz esxtension cord) could be enlisted by cutting off the female plug portion.
Providing you can open the case and locate the hot and neutral (typ white & black) terminal inside, wire the extension cord to the terminals. close case and viola.