Agatoxin and P-type voltage-sensitive calcium channels

[Jon Stamford]

We are conducting some experiments at the moment looking at the involvement of various types of 
voltage-sensitive calcium channel on transmitter release. We have already looked at L, N and T 
channel antagonists. Now we want to block P channels. The only selective antagonist I can find is 
omega-agatoxin. Unfortunately I cannot find a supplier. Also I understand that the stuff is 
ferociously expensive. Can anyone give me the address (street or electronic) of a supplier. Also 
does anyone know if it is irreversible or not. Finally, does anyone know of  alternatives to 
agatoxin that are selective but cheaper? Any hep would be much appreciated.

Thanks

Jon