Switching Mixers for LO frequency= 4.25Ghz
THese devices are not stocked as they tend not to be in high demand. The factory also does not keep stock. So MOQ = 10 * $23.11  or so.= $231 + tax etc.

However if you consider a cross-over part with similar specs, http://www.minicircuits.com/pages/npa/SYM-63LH+_NPA.pdf
This also has an MOQ of 10 but is less expensive.
10 x 12.95 = $130

Your choice.

Otherwise design a pin diode on a controlled impedance board to switch your LO with appropriate BP shaping filters.

Are you trying to jam with this band ?  ♬ ⚡  !