Select "trucks" and do a search for "Mercedes"...
I found 20 units for sale across the country. The ones that looked most likely to meet your needs ranging in price from $2695.00:
"Phoenix, AZ $2,695.00 1987 MERCEDES, 1219 - cab & chassis, eng problems, fresh trans, good tubeless tires, $2695, 602-278-7411, RAY & BOB'S TRUCK SALVAGE, 101 S 35th Ave, Phoenix"
"Sacramento, CA $9,500.00 1980 Mercedes L1116, 1980 Mercedes L1116 10 Ton Flatbed. 352 Diesel engine, custom red and black paint, custom interior, 14 ft. steel flatbed, tool box behind cab, chrome wheels, diamond plate trim. 300K on truck and 50K on rebuilt engine. Mechanically sound truck. Used to haul windows and shelving. Stored since 1996.Truck belonged to my father, so I do not know anything else about it. $9500/Best Offer. Located in Sacramento CA. Email for photos or info. Bigpantyranch@excite.com or call Sue at(916)331-7719 (916) 331-7719"
Some even had photos:
"Tampa, FL $8,950.00 1989 MERCEDES, 1317, Fuller brakes, 5 spd., 366hp, $8950 obo, 813-247-4483."
"Houston, TX Call For Price 1989 MERCEDES, 12190, diesel, standard, ps, pb, ready to go, call for special price."