Go an email Nov 10 from Circuit Specialists in the US showing these generators up for order.
SDG6022X 200MHz $1,499 (back order ships 11/29/17)
SDG6032X 350Mhz $3,339 (ships in 1-2 business days)
SDG6052X 500Mhz $5,299 (ships in 1-2 business days)
A fair bit pricier than the SDG2000x series but if you need the higher frequencies still probably a reasonable value.