These are week long supported rides with different routes each year. About 2,000 riders each though and camping rather than hotels. I've done Cycle Oregon and highly recommend it - at about $850 all in, a bit cheaper than the European equivalents - but there's also the cost of getting there.
If you want to go further afield you could try one of the American state rides like Cycle Oregon or Ride the Rockies
http://www.cycleoregon.com/
http://www.ridetherockies.com/
These are week long supported rides with different routes each year. About 2,000 riders each though and camping rather than hotels. I've done Cycle Oregon and highly recommend it - at about $850 all in, a bit cheaper than the European equivalents - but there's also the cost of getting there.