Fredo:

You can get aluminum ones from TNT landing gear for about 50 bucks or so -- I got a set and am just waiting on them now -- I was told that they are just a little bit taller than the stock (which is good for me cause I was really scraping up my sfg's). [link]http://www.tntlandinggear.com[/link]

Also, you can get them from Horizon Hobby [link]http://www.horizonhobby.com[/link] They are a bit more a 65 bucks or so. I had the same problem with my gear getting progessively weaker from my landings ha ha -- hope your landings are better than mine