FYI Aldi and Lidl show SCMSs for ?80. Aldi's is on Thu 7 May and, perspicaciously (!), Lidl have theirs coming up three days before, on Mon 4 May.
They both use 210mm blades. Aldi's takes more power but that's about all I can say to distinguish them. Lidl mention some details but not the slide length, and the Aldi web site tells you even less than the Lidl one.
The Lidl one apparently comes with batteries. They should help it cut through about 0.5mm of balsa. Or maybe they are for the laser. ;-)
James