On most league conditions you have enough to cover just about anything but a dryer lanes, the Purple Vibe will do that, so if you feel you see dry, then that's all you need to add, IMO.
If you don't see dry/dryer, then those two and maybe a spare ball and you should be set. If you plan to go to many different houses that conditions are much different, then I could see 4 balls, but for one house, 2 and a spare ball should cover it.
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az guy aka: R & L Bowlers Pro
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