This is just a rough idea on prices going off recent sales, some can be had for slightly cheaper some can be double.
Darth Vader (No. 3485) $50
Luke Skywalker Bespin (No. 3481) $75
Princess Leia Organa/Bespin $150-$200
"See Threepio" $50-$100
Han Solo Bespin $60
Artoo Detoo (No. 3489) $40
Chewbacca (No. 3486) $50
Ben (Obi-Wan) Kenobi (No. 3475) $80
Yoda (No. 3487) $50
Stormtrooper (No. 3484) $50
Ree-Yees (No. 3492) $30
Gamorrean Guard (No. 3495) $30
Nien Numb (No. 3493) $40
Klaatu (No. 3496) $50
Squid Head (No. 3494) $250+
Lando Calrissian (Skiff Guard Disguise) (No. 3491) $40
Logray $40
Chief Chirpa (No. 3498) $40
Boba Fett (No. 3483) $100 RR $1000?
General Madine $40
Weequay (No. 3520) $40
Emperor´s Royal Guard (No. 3521) $75
Imperial TIE Fighter Pilot (No. 3522) $50
Bib Fortuna $500 (burgandy)
Princesa Leia Organa Disfráz de Boushh (No. 3524) $50
Biker Scout (No. 3525) $50
Star Destroyer Commander (No. 3527) $40
Imperial Commander (No. 3526) $40
Admiral Ackbar (No. 3528) $40
Luke Skywalker Jedi $100
Paploo (No. 3554) $40
Wicket W. Warrick $50
Lumat (No. 3553) $50
Emperador (No. 50701) $70
AT-ST Driver $40
Prune Face (No. 50703) $80
Lando Calrissian (No. 50708) $80
Teebo $60
Han Solo Endor (No. 50706) $80-$100
Jawa (No. 50731) $500+ ?
Klaatu Skiff Guard (No. 50704) $50+
Rebel Commander (No. 50729) $50
Princess Leia Organa Endor (No. 50722) $70+
8D8 (No. 50728) $40
B-Wing Pilot $60
Cloud Car Pilot (No. 50711) $300
Rancor Keeper $50
Zuckuss (No. 50727) $40
Nikto (No. 50725) $40
C-3PO Removable limbs (No. 50709) $200+
Rebo band $200+
prices have been a bit all over the place, because you're after complete it will cost ya!
They are harder to find in great condition so when good complete ones come up for sale bidding can get hectic ie. $160 for an emporer, $200 for Klaatu