I've bought Joe Picone's as well. Not fancy but they do the job and are a nice soft delrin material so you never have to worry about them scratching the facing finish on the joints.
Just make sure you buy them from him on Ebay rather than off his website.
$38 on his website or $9.99+$1.50 shipping on Ebay.
As Duke mentioned above, his Ebay ID is ITSAHDEAL. Or just search for delrin joint protectors.
Once you've purchased on Ebay he'll send you an email asking you if you'd like the 2 shaft protectors marked. Single digit alpha or numerical, ie. 1,2 or a,b. I asked if he would do roman numeral I and II but he wouldn't. No biggie.
He's a super nice guy. He threw in one of his white diamonds jump/break tips in with my order because it shipped 2 days later than he said it would.
I have an extra 3 piece set of black delrin JPs in 3/8x10 and in perfect condition. They look like the ones in the attached pic. $16 shipped. PM if interested. Thanks, Cory.