It is still possible to find and use an old Hasselblad today. However, they are NOT cheap.
Ffordes Photographic has some Hasselblads and you can buy 120/220 format film. It will cost you about 15 pounds to buy and develop a roll of film.
The camera itself is about 1000 pounds:
https://secure.ffordes.com/index.htm
If that's really what you want and you have the money to run a medium-format setup, then go ahead...but if you want nostalgia for less money then 35mm cameras are the way to go. I would only run a medium format setup if you have a lot of money, you want a lot of nostalgia and you are serious about quality. Hasselblads were what the pros had ;-)