Raising suspicion isn't the issue for me I don't think. It's just finding a source that will sell to individuals rather than schools or businesses. Once it's in the post I don't see it being intercepted as I've ordered plenty of medication from an online pharmacy and it all got through.
I agree that out of date meto isn't much of an issue - they're very conservative with their dates, worst case the concentration will just be reduced for a bit.
I tried gas, always ended ripping the hood off, the feeling of suffocating was too strong. Then I had to find a way of getting rid of three large gas cannisters that nobody wanted. I still don't know why it failed for me, no-one has any good answers. I even tested the gas for co2 and it was negative so idk. Why does getting all the equipment frighten you?