Pretty easy to make from plywood, outdoor carpet (thick is better), a pitching rubber, and a couple of casters. I've made 2 to have at the house (the boy outgrew the 1st one). Even if you had to buy all the materials, you can do it for $100.
We had a high level 12U and 13U team build our own as the post above suggests. Building your own, as opposed to purchasing one, will allow you to have multiple mounds for what one would costs thus allowing you to get more reps in with your pitchers.
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