If your equipment is all used, I would just keep it and wait.
The sad fact is, used bowling equipment has very little value. The value a year or more from now will probably still be low, but new equipment will be costly. The one gamble is balls can crack over time then they become worthless(instead of being almost worthless).
And who knows, you might have one of the rare gems that increase in value after a year.
Hope you are back on the lanes soon!