Purchasing Mizunos from ebay.

So im looking to purchase a Mizuno JPX-825 Pro iron set. Golfsmith has them at $599 on their site however a very reputable ebay store called budgetgolf has them for 499. Has anyone purchased clubs from this store? Why are they $100 cheaper? Ive heard that it can be unsafe purchasing clubs on ebay due to knockoffs but this store has some great feedback. What do you think?

Just found this on their ebay page:

 We are a family owned retailer that has been in business since 1993. Each and every item we sell is authentic. We are an authorized dealer for all manufacturers. We only sell items we buy direct from the manufacturer. We have never once sold an item that did not come direct from the manufacturer. We stand behind all of our products. If there is a problem with any item please let us know and we can assist. In the event of a damaged item, mis-shipped item, or lost package, please rest assure that we will take appropriate actions and proceed accordingly under our guidelines and policies. We may not be aware of any problem unless contacted, and we will do our very best to remedy a solution. Inventory is subject to change. Some items do sell out faster than expected. We do apologize for this occurrence.

Thank you Bill!!! Should have done a little more research before posting. Sorry about that.

call mizuno and check the serial numbers - they are great about telling you where the clubs were sold and if the serial numbers match the clubs you are inquiring about