Learn English – Making acronyms/initialisms from hyphenated words

When using acronyms in writing, the APA Style Guide recommends:

When you do use abbreviations, always give the full name the first time you use it: The Modern Humanities Research Association (MHRA) -- unless it is commonly used as a word (AIDs, IQ, URL). Write out the complete name, and then give the abbreviation you will use (as illustrated above), unless the abbreviation is widely recognized (CIA).

IBM is a fairly well-recognized acronym. If you must write out the fully qualified name, however, then the most proper sentence would be:

We would like to use International Business Machines (IBM) machines.

As @Randolf mentioned, though, you might want to avoid calling them "IBM machines" because of the redundancy.

According to the Guardian style guide:

The possessive in words and names ending in S normally takes an apostrophe followed by a second S (Jones's, James's), but be guided by pronunciation and use the plural apostrophe where it helps: Mephistopheles', Waters', Hedges' rather than Mephistopheles's, Waters's, Hedges's.

So I would likewise go by pronunciation write it as:

Buy CCS's New Product.

Or rewrite to avoid it the apostrophe altogether.