WTB PBS to combine 2 red lasers FAST! like here by saturday

Okay so i have been building a dual and some where i read i could use the cube i got out of a GGW sled to combine 2 beams. well that seems to be failing. no matter what way i rotate the beam goes threw.
So i need a cheap place to source one or buy one. if you live within around 120 miles i will pick it up.
msg me asap.