There's a couple of bonds opened up previously which seemed to complete to everyone's satisfaction.
You bring up an interesting proposal though, which is a bond market to put buyers and sellers together. What I mean is that typically the bond seller will advertise and then players like yourself will invest in them with a certain risk.
The current challenge to this is the reduced open market activity. Typically a producer will create a bond to boost resources in order to produce product that is beyond thier current means. For example, it costs about 18M NIC in mats to build a Lithus, but you first need to spend 25-20M NIC to buy and RE one, as well as it taking almost a week for a run of 10. So a manufactor will put out a 200M NIC bond, then 2-3 weeks later after building and selling the batch for 25-30M each, have 250-300M NIC. They pay back 10%, 220M NIC, and have a nice 30-80M NIC profit.
However, now it's unlikely you'll sell 10 units in 3 weeks at that price. There are many producers now that can easily afford large runs of heavy mechs without needing bonds, so they can and will price agressively. And simply the market for selling bots is much smaller now which simply makes it unprofitable to build with bonds.
I can however see bonds being important again once there are things to build that are very expensive again (in relation to the amount of NIC/Materials in the game).