Re-inserting photos since my old photo hosting site died.
I've bought 16 Commandos in the last 18 years; so although I could give you a decent idea as to condition / price, would only reflect the approximate market value around the date of purchase. Further, regional markets vary, and all markets fluctuate with the economy and various relative currency values.
Still, for what it's worth...
1998: '74 JPN incomplete, unrestored, but correct JPN bits, no seat, no fairing, one muffler, almost running, very dirty - Traded for complete Personal Computer system with software, printer & modem (value est. $2,000 at that time). The other party reneged on the trade 2 days later. (Local purchase) This was actually the "before" photo from the SECOND time I bought it; the owner had sourced some mismatched parts to try to build a replica of a race bike he saw in a Norton book. Good thing he stopped at the seat and fairing...
2004: '75 Interstate MkIII, unrestored, totally original, excellent condition with clean title - $3,500 from a friend, locally.
2006: '70 Roadster, chopped (horribly), non-running, no title, frame, engine and rear hub only usable components - lot purchase, this bike approx. $750 plus $100 gas to fetch it (Okla City).
2006: '70 Commando engine in custom chopper frame, non-running, no title. Rescued bare engine only. Bike #2 of 3-bike purchase; this bike approx. $500 + $100 gas to collect (Okla City).
2007: '74 Interstate 850, good runner, title, good condition - Bought from a friend (2-bike deal in Austin, TX) for $3,500.
2007: '73 Interstate 850, good runner, title, good condition (Corbin seat) (2-bike deal) $3,500.
2007: 71 Roadster 750 in excellent condition w/ title, bought from a guy in Macon, GA - $5,000 + $250 cost to collect w/ another bike
2008: '72 Combat rolling project with Leo Goff built engine, Norvil front disc setup, ARD mini magneto, Corbin seat, no title - same acquaintance in Macon, $4,474 incl. cost to collect w/ 2 other bikes & many parts
2008: '70 Commando basket case (assembled to roller, missing some core parts, no title; part of above deal) $1,650 collected.
(can't find the dang photo, sorry)
2008: '71 Roadster 750, good runner, Decibell mufflers, w/ title, 95% original, picked up in St. Louis for $3,500.
more...