Just, Pheonix, Planet, Smart Parts the whole lot of em
You can get it in different sized tubes. I bought the big one for about £10 if I remember right from Pheonix. The thing will last you a lifetime though.
White Lithium grease should work too, that's what I use on my besales bolt. I bought a pound of it for something like $3...it's dirt cheap. You can buy it at a hardware store or possibly an auto parts store.
I did have (well was using) white lithium grease but the manager owned it and he has left now so im with out any, '(HUM)'I wonder if Vaseline would work'(HUM)'