Hmm. I think I know who I can ask. Will do so tomorrow as she is probably half in the bag by now. Awe, just kidding. You know how I can be.
Tj....you are the most awesome friend for anyone to have but especially anyone that lives in Cancun. He can find anything and is always ready to help a friend in need. There for sure will be special place in Heaven someday for The Tooje!
You can get jars with one piece pressure lids at Mkt 23 sort of across from the chicken place that is on the west side. They have all kinds of cheap kitchen stuff there and the jars are on the left wall. If you are driving, the chicken place is on the left (facing Chichen Itza for the direction challenged) and the jar place is on the right. 280 gr size is $13 & the ones that are maybe 700 gr are $16. One oz = 28 gr. If you buy a box of 12 you can get 10% off but you have to ask for it.