I have taken on a project of building a retaining wall for a customer for his garden in his back yard. It will be on a incline, starts up hill then drops and goes back up again. Two terraces. the wall is to be apprx, 22-24in., I measured about 65ft for the first terrace and 40ft for the second. The customer prefers the 1.99 block at Lowes, castlewall.... Is there any recomendations of a decent bid range, and perhaps tricks/tips/hints to increase speed in putting up a retaining wall. This is my first time to do this, I've done some research on how to but I would like to hear from some people with experience. PS - I'm located in GA if that helps with bid$ at all.