While not specific to Hasselblad, I've used the worlds cheapest plastic tripod available from WalMart and anywhere else for around $20 with a bit of patience..

With my Pentax 645, long cable release and a string or strap tied/hooked to the bottom of the center column and pulled taught with my foot I can stabilize the camera quite well. Probably wouldn't work so well for long lenses, heavier cameras, etc.
I'm almost sure a P67 or an RB would visibly shake the tripod as it's mirror comes slapping back.

My real tripod is a Husky Quik-set 15lb. monster, meant for cine cameras.
The cheapy tripod is what I take when I'm going to be on my feet for 12 to 15 hours..