Would you consider some free Office suites as an alternative MS Office ?
You would have some learning curve, and perhaps find some missing functionality you can't live without.
But, you can try these for free.
There is Libre Office, and they have a portable version so no installation is needed.
Home | LibreOffice - Free Office Suite - Fun Project - Fantastic People
I prefer MS Excel, because I've been using it for many years.
There is WPS Office (formerly Kingsoft)
WPS Office 10 Personal Edition - For Home and Student
For me the problem with the free version of this is after the 30 day trial period i can't save Excel .xlsx files.
I can save them as .xls, and i can open/read .xlsx
This is just 2 examples you might consider, I'm sure there are more.
Also, there are probably free Word Processors you could try, if you only need MS Word.
I'm just pointing this out in case you're not aware of these options.
Also, from what I know Office 2013 is not a subscription/annual license.