My guess is the one without an Ethernet port should be cheaper, but sadly I can’t find it on Amazon.sg. I only found the one with an Ethernet port on Amazon.sg retailing for S$139. After a 5% discount voucher, I got it for S$132.05.
It is tough to find a USB-C to DisplayPort Cable or USB-C to DisplayPort Adapter. I have not found any physical stores in Singapore selling it yet. Instead, you have to get it from online stores like Lazada or Amazon.
For USB-C to DisplayPort cable, I bought mine from Amazon as there are more choices to choose from.