What on earth are you doing to need 350MHz scopes?
I'm still stuck with an old 20Mhz CRT scope.
though I did pick up a couple of reasonable USB scopes from ebay recently.
one with 2 channels, and enough bandwith to do radio frequency (which I never do).
and one that's an 8 channel automotive, that should have enough bandwidth to do 8 channels of audio frequency. (where I am interested in audio electronics).