Well, gee <scuffs toe> , thanks, momlaw <g>
Woodson Lumber would be my first place to look.
If decking dimensions--5/4 x 5½"--would suit, both Lowe's & HD can order in some.
Hope Lumber on Longmire probably ought to have some decking-sized Ipé.
Brazos Flooring has outlets in several Texas cities.
To OP, get brand new blades & bits for working with Ipé, it's hard stuff. I'd be very inclined to get some veneer blades for making more kid-friendly cuts. Oh, get lots of extra sandpaper, too. (Although, I prefer a plane or scraper as it makes a better finish.)
That's my 2¢; you'll need another $4 for a happy meal.