you can get many many cartridges on ebay for 15.00 and less in new condition. That's where i have been buying mine lately. Also, some of the CM Cricut carts have three fonts on them plus shapes so they are worth even the 55.00 price.
Someone posted a website to check the sales for Black Friday on the Silhouette Group on FB. M's will have the Teal Expression 2 with the French Manor Cartridge for $179.99 and cartridges starting @ $19.99, Joann's will have the Cricut V1 for $79.99 and Fiskars Fuse for $179.99 and ACM's will have the Cricut E2 for $159.99 and the Cricut Mini for $88.
If anyone is interested on the link, please feel free to PM.