This Co makes Real Estate "Post" signs ....standing 60" above ground and 36" out....where you pound in a long Stake and slip the sign down over it so there's no need for Digging a Hole. Their fee....$59.95 for the post and they ALSO make the actual signs to your specs.
http://www.buildasign.com/SignAccess...colonial-frame
Also....this company covers NINE States. Uses EIGHT FOOT high by 4ft out, wood signs. They charge $38 for install and $38 for Removal. HUGE operation.
http://ljssigns.com/
Heck...even if you charge $25 for install and $25 for removal....with 100 signs going and coming....it could be quite lucrative.
Best of success to you,
Don Alm