furniture (Mexico City)

We will be moving back to Mexico City (Cuajimalpa area) this summer and we will need to furnish an apartment. I know I can go to Sam's Club, Costco, Sears, etc. to furniture & appliances. I would like to make the best use of my budget. 1.) Does anyone know or the best place to buy inexpensive furniture or ... 2.) does anyone know of someone leaving Mexico City this summer that might want to sell some furniture at a fair price? Thanks. Mike