Hi rf-technology dudes! (if there are some, or at least one!)

I need a mixer for 2GHz and I'm searching one with low LO power.
Someone knows if there could be one with less than 0dBm? What's the lowest you've seen yet? (I have a 7dBm-LO-power mixer which can be used at 4dBm due to the datasheet. But not sure what happens below that...)

- RF power is less than -50dBm
- IF should be able to go down to DC

Or maybe someone experimented with powers below the specifications?
(I know then the harmonics will increase, but atm I dont care about that)