Consignment sale for a collector who is downsizing. Our client acquired it from the estate of a TI dealer, which explains it having remained new and unused.The box shows some shelf wear and a small piece of Styrofoam has come loose inside the tray - please see pics. Listing is for the unit only with no computer, game cartridges or other accessories. We also have some game cartridges from the same consignor and will be listing them in due course. This is a very rare find and the only NEW one on the market - don't let it get away! Powered by SixBit's eCommerce Solution. The item "NEW MBX Expansion System for Texas Instruments TI-99/4a Home Computer Very Rare" is in sale since Tuesday, January 7, 2020. This item is in the category "Computers/Tablets & Networking\Vintage Computing\Vintage Parts & Accessories". The seller is "panhandlesurplusllc" and is located in Borger, Texas. This item can be shipped to United States.