Nice LP2065! That's my primary monitor too, which I bought second hand.
My recent 'retro' purchase from 2007, is a Zalman Trimon M220W 22" passive 3D monitor. I didn't actually want the monitor, as I already have the Trimon 19" version, but I've lost the glasses, and buying new ones is expensive and requires shipping from the US or Japan.
I then found a UK seller with a 'broken' M220W, complete with glasses, and box. Haggled down to 25 quid delivered, using the Argos collection option. Impressively they'd retained the original box, and it looked in perfect condition. Even more fortunately, the monitor seemed to work just fine.
Unfortunately at this point I finally understood a disadvantage of a passive 3D monitor - for one that large, I simply can't find a position where the whole image is legibly in 3D perhaps unless it's my primary monitor, and this is very definitely a glossy gaming monitor not exactly ideal for productivity. Looking at it sideways on there's always a bit of the display that doesn't look 3D. Being a 16:10 1680x1050 monitor, it's quite wide horizontally. The 4:3 1280x1024 monitor doesn't suffer in this way.
So, let's play 'swap the VESA mount'. The 19" monitor has the shittiest mount ever (tilt only), but the 22" mount is height, tilt, and swivel. 22" mount goes on 19" monitor, an old 17" monitor with a decent mount goes on the 22" monitor, and the 19" monitor mount goes on the 17" - but with the panel rotated, so it's permanently portrait. Win.