Due to the Provocraft lawsuits, SCAL is no longer available for any Cricut. If you buy expensive cartridges, your best bet would be to put that money aside and buy a machine that works with SCAL. One of the most popular units closest to the price of the Cricut seems to be the Silhouette Cameo for around $269 (the website says $299 but I've seen them lower at Oh My Crafts and other sites).
Silhouette CAMEO
There are lots of other cutters out there besides this one. I still have my Cricut and will use it until it dies and then replace it with something ... "anything but a Cricut".