You don't have too!I also do not want to spend 150 or so for a drilled 10 pin ball.
A good polyester (Plastic) spare ball can be had for less than a hundred dollars. Those $150-$199 dollar spare balls are not regular spare balls, they have dynamic cores and are more for use as dry lane strike balls.
I just got a new C300 Whitedot (which is one of the most widely used plastic balls) for $85 that's drilled plus finger & thumb inserts.
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