Before you buy or adopt a pony make sure that you meet the minimum requirements:
Remember, an alternative to pony sales is adopting an unwanted or neglected pony.
The Guide Horse Foundation recommends that you consider adopting an unwanted, abused or rescued pony from a pony rescue organization or buying a miniature pony from an auction where the killer buyers attend.
Internet Miniature pony sales Board - Equine.com has a great miniature pony sale board
There are also internet miniature ponies sales.