Dumb Question Regarding the Early Singles Box

I just about blew my spending money on the Immersion sets this year, so there's no way I'll be able to buy this set new. I did notice they released one of the CDs separately, however. Would they do this for all of the CDs included, maybe over the course of the year? If so, would there be any way to get the special items they include (posters, 7 inches) separately as well? I'm itching for previously unreleased content, but at the same time I do want to eventually have the whole set. Any suggestions help!