Are there any bitcoin sites still taking wagers on this?
Yes, FTX.com has a contract for TRUMP making a come back until February 1st.
I wrote about it here:
they called it TRUMPSTAY and TRUMPGO, they're open for trading now and like before it'll expire to 0 or 1 USD according to the results.
take into account that FTX is not open for US residents, but if you're using less than 2 BTC you can probably just use a VPN.