Okay we have more information.
First the pins don't weigh 30lbs each,
Balls from sporting goods places in the long run will be the same or more than the pro shop. Also most are just plastic balls, though you can find some low end urethane,reactive and I have seen a cheap particle ball. Once you figure in the cost of the ball, the drilling etc. .
Most pro shops offer Ball and bag deals, you get a Ball (usually plastic) and a bag (sometimes even shoes). Most of time it includes drilling too. This would be the most cost effective option. Plus you start a relationship with the pro shop which can offer other benefit down the road, that you won't get with a sporting goods store.
As far as weight goes, IMO a 10lb would be better (not more than 14) but talk to the pro shop they can tell you better.
Here's what Ron Clifton say's:
The first thing I check when trying to pick a ball weight is the persons wrist strength. I have them hold the ball down by their side with their wrist relaxed. Then I ask them to cup their wrist forward. They should be able to hold that position for a slow count to 10 or the ball is too heavy. This goes for men and women. I have seen a lot of men and women that could fire a 15 or even 16LB ball down the lane but can not pass my wrist test with them. If you can't pass the wrist test, then you can't have a good strong release or much versatility in releases.
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