The DSI is a lot cheaper, though both the DSI and the Aibo are cheaper than the Matias Tactile Pro 3, which has a proper ANSI layout. Ideally, you could buy the DSI and a used Dell AT101W, swap leaves and springs to get what are essentially ghetto complicated white Alps on the Dell and ghetto simplified blacks on the DSI, and thus get a proper ANSI Alps board with complicated whites (which are considered better than simplifieds). The overall price would be similar to the Aibo, but you get two boards instead of one and a non-funky layout.
(remember to swap springs if you do this since black Alps use heavier springs than white Alps)