<VV> AC Refrigerant question - limited Corvair

[grant young]

After replacing the better part of two Ford Exploder, one Pontiac Montana, and one Chevy Lumina a/c systems over the past month or so, I am in the need of a bunch of R134a. I have located some in CA for $129 (including shipping to FL) for a 30 lb canister. I am wondering if anyone knows of some cheaper anywhere? The best deal I can find locally is in the $170 - $180 range. While I don't need this much at once, I owe my father-in-law about 6 lbs, and am sure I will be able to use the remainder (for the hearse and olds and future failures).  I can get it cheaper if I order more, but would need to get 5-6 canisters at once.  So, if anyone needs any or knows of a better deal in bulk, please let me know via a private email to gyoungwolf at earthlink.net unless you have a great deal to share :-). (FWIW, a LAPS owner friend of mine says that DuPont is controlling the supply to keep the price inflated, but that is a discussion for another forum :-).
Thanks,
Grant