Bowlingball.com occasionally has some really good deals on them. I have accumulated a collection from 500-4000 without spending much money. As a starting point you can get the final step for a particular ball - which is usually all you need for a 10 game or so refresh. I also have some Siair pads and they seem to last longer, but cost more upfront.
Other than refreshing every 10 or so games by hand, more extensive stuff will require a ball spinner. So if you don't have one you won't need abralon pads for all the lower steps as you will still need the proshop to do it.
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