Sorry, no founds for lending, but if you need an OSX environment quickly, you can run it on on an average PC:
http://www.sysprobs.com/easily-run-mac-os-x-10-8-mountain-lion-retail-on-pc-with-vmware-image

If we talking about cloud based Mac environments maybe you want to take a look at this site too:
http://www.macincloud.com/