I think it is still acceptable to send the correct amount in 1st class stamps, might want to email and ask first. With .39 ea it does mean you would be sending a tip because you would need 6 or you would short change them. Back when it was 25 cents each it was easier, we'll never see that again.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.