We bought a large trampoline for the kids this summer from Jumping Star. It was not cheap at 240 euro (plus shipping) but it has been in constant use since we got it. This picture is of the 3.1m version which is small compared to the 4m version we got. It takes a lot of space in the garden but it is safer as the kids can jump together without bumping into each other.
I is certified for 100kg so I can have some fun, and get some exercise, as well :-)
The site is in German but the great customer support speaks English.