If you were wondering how to make a cheap air based reliable rejuvenator, you only need 3 things:

1) the cheapest hair dryer you can get
2) the cheapest storage container you can get that a bowling ball fits in
3) a digital meat thermometer

Steps:
1) cut a hole into the bottom portion of the side of the container to fit the hair dryer
2) poke a hole in the top of the container lid for the meat thermometer
3) find something that elevates the ball above the air current of the hairdryer (I use an old tomato can with a towel on top of it)

Then, you run the hair dryer on low to see what temp the box reaches with the lid on. Mine reached 120, so it was perfect. The plastics the storage containers are made with are usually good for much higher temps, and you can just Google what temps each one is rated for just to be sure. All for 25 bucks or less, depending on if you already have the supplies.

P.s. Make sure the air isn't directly hitting the ball. Also, don't just leave it unattended, the temp controller is you and your eyes looking at the gauge constantly. Make sure you get the temp you want before putting any bowling ball in it. If your ball cracks, then who cares because it was dead anyways and you have 200 bucks left over from not buying a fancy overpriced dehydrator.