I could be wrong here but I think Akitio's is about the only one still on the market.
I have the TB1 version of the Akitio (also bought well after TB3 was out) and it still works pretty well - but it'll depend a lot on what you want to connect. It's focussed on traditional peripherals more than the recent TB3 ones are: FW800, eSATA, USB3.0 - not ethernet, displays, card reader, etc.