Dont just recone them have them totally rebuilt from the basket up,new voice coils & the whole shebang,it dont cost that much more than a recone & what you get is a brand new speaker.
I use Michigan Sound Reinforcement exclusively,they have rebuilt all the woofers in my JBL L-250's,rebuilt all 4 woofers & both mids in my Mcintosh XRT 22'S,rebuilt both woofers & both tweeters in my Mcintosh XL1'S,rebuilt both woofers in my Klipsch Horns,rebuilt the Manta Ray horns in my Altec 14's that are on permanent loan to my brother

.,thats just off the top of my head,if i tthought about im sure i could think of atleast 10 more rebuilds they have done for me over the last 20 years.
These guys are top flight & when they get done with a rebuild your good to go for another 30 years,a total rebuild on a 12" woofer with dual voice coil is around 60$,with a pleated surround about $60 & with a regular surround & single voice coil about $40.
Shipping would not be that bad from Chigao to Michigan,turn around time is usually about 1 week,if your interested let me know & i'll post their number.