That one is an English pad actually.
Making your own pad can be cheap, but you should be careful with western pads as western saddles really should have some more cushion under them (if the under lining is synthetic fleece). You can get sheepskin pieces/pelts off eBay, use that by itself or sew a cloth or canvas top on it. Use a rectangle wire dog brush to fluff it up after every ride (and it gets some of the dirt out). I suggest only using "natural" colored sheepskin against your horse (that tan color). If the sheepskin is deyed poorly, it can rub off on your horse when he sweats.
"To be an equestrian in the classical sense is not just to be a rider. It is a position in life." --Charles de Kunffy
Anti-Slaughter and Proud!