Well, it all depends on what you want. I got the M2 with T/E from Ohio Ordnance, nice, but big $.
I really wanted the MAG58 tripod, but they are $400 and up if you can even find one.
Many of the guys are using the Bren tripod with an adaptor to fit the 1919. The tripods are rough, need refinished, but cheap ($100 range)
You can adapt a MG34 /MG42 AA tripod for stand up use also. I think I'll try one of these next. Interordnance has them.
They have parts sets here.
This is where you get the trunion shields and different pintle adaptors.