Gene Expression Omnibus or Array Express

you have to put them in the right format and send it to miame or GEO. as far as i know geo is easier to submit data. there is a lot of help and pipelines to have your data submitted more or less straitghly

Johnathan and Frederique are right. Just want to add that in order to publish your data sets on those public repositories, your data have to be compliant with Minimum Information About a Microarray Experiment - MIAME 2.0. standards http://www.mged.org/Workgroups/MIAME/miame_2.0.html

Instructions on how to submit data to GEO are here: http://www.ncbi.nlm.nih.gov/geo/info/submission.html

Instruction on submitting data to ArrayExpress are here: http://www.ebi.ac.uk/fg/submissions_overview.html

I hope this helps

Good luck!

Try GEO DataSets from NCBI

http://www.ncbi.nlm.nih.gov/gds

you're working in france so for help to direct submission to geo you can contact the team of bioinformation in IPMC of sophia antipolis if you need the e mail of the personne in charge let me know by personnal message