Hi and Welcome. My Name is XXXXX XXXXX I look forward to assisting you today with your question.
Before we start, please remember these things. It may take more than one step/answer to solve a problem. So If my answers don’t work or if you are not satisfied, please don’t Rate my answer bad/negatively (First two left Stars/Faces/Ratings are Negatives) but please Reply back to me by clicking the “Continue Conversation” or “Reply” button. Remember, only Rate answer after you are 100% Satisfied.
Yes. Buy the Mac OS X 10.6 Retail
Installation discs and install it on your Mac. After installing 10.6.x (x is version number), you can update directly to Mac OS X 10.6.8 from Apple menu > Software Updates
After installing 10.6.8, you can buy/download latest OS X and other applications from Snow Leopard's AppStore as digital download.
FYI Apple had removed 10.7 Lion from AppStore when they released 10.8 Mountain Lion
You can buy 10.6 Snow Leopard Retail disc from eBay.com or Amazon.com etc
Let me know if that didn't work, so we can continue troubleshooting. Don't Rate my answer until you are satisfied.