The Pro Shop can be found from the Main Menu. It only sells items that provide cosmetic changes to your shuffleboard experience. All of the items in the Pro Shop have a combined value of $30,000. There are four categories of items, each with six variations to purchase: disks ($1,250 each), pins ($500 each), tables ($2,500 each), and frames ($750 each). To purchase an item, just select it from the store and confirm the purchase.
After completing all of the other achievements, you will likely still need to grind $10,000 to $20,000. Money can be earned in any game mode, but Bowling is the quickest/easiest. Below is the the breakdown of money for Bowling:
Spare = $10
Strike = $25
Two Strikes in a row = $50
Turkey = $100
Your ending score also gets converted to a dollar value as well.
You should be able to get $200-$400 per 10-frame game of Bowling. Focus on picking up consecutive strikes as that is what really boosts your score and cash. This method will allow you to cut the grind time to around one hour after earning all other achievements.