Bernard Lieber wrote:
Download a 30-day trial version from the Adobe site, save your InDesign files as .inx and you're in business or ask your customer to save them as .inx for you.
[Edited at 2013-01-07 18:27 GMT]
InDesign is available from Adobe in a freelancer version, for which you pay a monthly subscription of about $30 as needed. If you only need it for one job you can pay $30 for which the license is valid for only one month. You can do it again in, say, 6 months, if you need it for another job.