Hi and welcome to the forum! Its great that you are researching buying a hutch before you go and buy one.
If you go onto the Housing section of this forum, there are lots of stickys with pictures of set ups. There is actually a minimum recommended size for a hutch and that is 6 foot x 2 x 2. Also to have an attached secure run that rabbits have access to all the time. This is because rabbits need as much space as cats, which mostly people have freeranging.
Have a look on gumtree and preloved. There are usually lots of second hand hutches for sale (although mostly smaller). For a new 6 ft hutch, try homeandroost, welfare hutch co and many more do the larger ones.
I'm sure others will be able to advise you also, but do have a look at the stickys at the front of the housing bit as there's lots of advice there.
Also look at the rwaf video, 'a hutch is not enough. '. It'll show you about housing a rabbit.
Lots of info on here so have a good look round the forum!
What kind of rabbits are you getting?