Compression sleeve will help.

My elbow on my bowling arm has been hurting lately.  My chiropractor said its tendonitis.   Any supports out there on the market that I could wear while I bowl to help?

I struggle with this constantly.  I wear one of these on my bowling arm when I bowl.  I purchase them at CVS and usually get a full year out of them before the Velcro starts losing its effectiveness.
http://www.futuro-usa.com/3M/en_US/Futuro/Products/~/FUTURO-Precision-Fit-Elbow-Support?N=4318+3294508212+3294529207&rt=rud

My elbow on my bowling arm has been hurting lately.  My chiropractor said its tendonitis.   Any supports out there on the market that I could wear while I bowl to help?

 
First a sore thumb, and now tendonitis….. 
 
The tendonitis is a result of a bad grip, bad form, or a combination of the two. Any sleeve or elbow strap will do nothing but mask some of the pain (not all) and will give you a false sense of security that could turn into a chronic condition.
 
I learned this the hard way many years ago when I developed tendonitis on both sides of my elbow. I tried bowling through it with all the 'band-aid' options available, and all I accomplished was being out of bowling for almost a year.
 
First, stop bowling. Life will go on. Second, see an orthopedist and get a prescription for directed physical therapy. Finally, get professional bowling instruction to fix your form and your equipment. 
 
It's the only way you'll get off your merry-go-round of arm and hand problems. There is no shortcut to avoid these steps.

Fix the cause of the problem.

The cause is the twisting motion of the forearm (similar to using a screwdriver) except that your thumb is more than likely still in the ball. 

Solution:  Get your thumb out earlier, and cleaner, before turning the ball.  OR  stop twisting, or turning, so hard.  I used to require cortisone shots there from time to time, which helped, but once I understood the cause of the problem haven't needed one for over 5 years.  If you can get your thumb out earlier you can turn the ball and not have the pain because there's no "torque" on the area.  Good luck.

Thanks Rico,

It was a sports medicine doctor that described how the tendinitis occurred with me.  Mine was in the forearm, just below the elbow. 

According to him, the tendons become inflamed due to a "new" or a "repetitive" movement.  Bowling is definitely a repetitive thing, but it's especially hard on those tendons when our thumb is "locked", so to speak, in the thumb hole while we twist or rotate around the ball. 

I can only go by my own experience, but when I started getting the thumb out earlier (or rotating later) the problem was solved.  It's been over five years (and I'm five years older) so to me it's no coincidence.

We can only guess, from this forum, as to why you're having the pain without watching you bowl.  Stretching and warming up muscles has become increasingly important as I have gotten older. 

How many guys do you see throw their first few practice balls with full effort?  I know my first several are at 60-70% until these old muscles, tendons, ligaments (everything else) are ready for action.

Having had a shoulder reconstruction surgery, and LOTS of rehab since, I can fully agree that damaged tendons and muscles are never quite the same.  My bicep was torn, my rotator cuff was torn, and bone had to be carved out of the joint (other than that my shoulder was good ).

While going through all the rehab my surgeon was constantly reminding me that I had a "repaired shoulder" and not a "new" one... Because he saw that I was eager to get strength and flexibility back.

I was hoping after $45,000 I'd have a new one...

They are actually spelled correctly both ways