Mule palms are typically a cross between a Pindo (Butia capitata) & a Queen (Syagarus romanzoffianum) and retain much of the Queen's appearance (greener than a Pindo) while being more cold hardy like the Pindo, and also much slower growing like the Pindo.
Here's a pic I took at Villages Palms of a Mule (on the left) and then a regular Queen to the right of it. I believe the Mule was in the $600 -$700 range.
Let me also say this. When we eventually move to TV I will not hesitate to plant Queens, Roebeliniis, Paurotis and other marginally hardy palms for that area. I currently grow butias, sabal palmettos & windmills up here in Alabama. Pretty sure I'll be more than ready to move on to the more "exotic". So far this winter our low temp here is 28F......tempting me more & more to roll the dice & plant a Sylvester. Hope our "warm" winters continue.
Happy palm growing to all......
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east central Illinois, St. Louis, Baton Rouge, Houston, Atlanta, Birmingham, AL