This is a good location, though good odds you were moved here. Anyways;
100USD without the PSU. You should be able to ROI before your few months of electricity run out. So it would be a decent deal if you resell them at the end of your "free electricity" period for some extra profits. Good luck.
A lot do the resell them at end so Virosa is giving pretty good advice on making most of the "free" time you have. On PSU's you can use them for multiple generations, so it is not to bad on having them around. Also you can sell the PSU if need be in the end.
S3's were built tanks so they should be mining for quiet a while longer just the S3 miners are getting kinda dated for those who pay electricity.