I bought my Cameo in November and haven't had to replace either yet. I did have a bad blade initially, but the replacement was perfect. I have lots of Silhouette cards/projects on my blog
(see "Silhouette Cameo" under categories). You can save your svg files either in Silhouette Studio, or elsewhere on your computer.
If you want to get a membership for the online files, sign up for the Silhouette newsletter, they'll let you know of sales. I bought my subscription when it was on sale...definitely a great deal! HTH!