The similar 'RMT Club' has already been out awhile and comes in either 4 or 8 pound weights for around $110...
I don't own an RMT Club, just a bunch of 'regular' steel clubs from 5 to 45 pounds, and the workouts with them are BRUTAL and very effective. An additional benefit to using weighted clubs is the grip workout that they provide, as a matter of fact your grip will probably be the limiting factor at the beginning, so stick with it !!!
New to the forum. I think I may have looked here a year or so ago, but I finally registered.
There is always the option of making your own homemade mace at a fraction of the cost -- in fact, you could probably make different sizes at that. Basically you are buying a bamboo stick, some concrete, a clay pot, some screws, a bit of paint and you're off to the races.
I have the RMT Club, with the goal of increasing speed and power for driving a disc golf disc. It’s different than a mace in that the weight inside shifts with your movement adding more stress at the end of any movement. The interval workouts with it (like a Tabata protocol) are pretty great esp if you’re pressed for time.