Globaleyeglasses.com sells trifocals.
I got two pairs of single vision from them recently. Before I ordered,
they told me production would take four days and shipping would take
eight days. True to their word, I received the glasses -- which are
made in India -- in twelve days.
They're both pretty much dead on my Rx (my first of three in three
months), and one frame is much nicer than the photos indicate. I've
seen some poor reviews on GE's customer service, but my limited
experience has been pretty good so far. They have allowed me more time
than their stated return policy in order for me to see a new doc, and
to choose a new frame to replace one of the frames I bought which I
didn't realize would be too small for me. My Rx has changed twice
since ordering, so I'll pay a little more to get new lenses for my new
Rx (50% of the upgrades plus shipping) and my local optician will
install them in their plastic frame for $10. GE's phone system sucks,
so the best way to contact them is via chat, which can be printed or
saved for a perfect record of all correspondence.
Recently, they've had a two for one for frame and basic lenses offer
with the code "buy1get1." I don't know if it's still good, but it
can't hurt to try to apply it. Upgrades, coatings and tints are cheap,
though when I just tried it, it seems that options are limited for
trifocals. So far, my only frustration with GE is that they don't have
a lot of affordable wider frames with longer temples for big guys like
me. They have a few wider designer frames, but they are more
expensive.
Without being able to measure for seg height, I think getting
multifocals and progressives online is a crap shoot. GE offers two seg
heights for their bifocals, so if you decide to order trifocals from
them, you should chat with them to see if there are any options for
different mounting points for trifocals. I'd be curious to find out
how well they work for you too, so please post about it if you get
them.