some time ago it was possible to trade mini 30 yr t-bond and 10 yr notes. Have they been delisted , i can't find them anymore.
Yes those contracts are history as of last summer, I posted a link here a while ago (last May?) to the CBOTs announcement, which just mentioned de listing them, I am sure you could find it in their archives if you wanted to.
Yeah they were gone as of early last year; from what I recall they were a nightmare to trade with markets 10 ticks wide sometimes even during regular hours on the front month. It's a shame since they provide a great way for smaller traders to leg into/out of positions ala mini beans or the mini EuroFX which has matured into a pretty liquid 24-hour market.