I've used lens.com, they all have pretty competing prices.
You need a prescription from an eye doctor though, but I got around that.
Mind sharing how you got around that?
My eye doctor won't give me my prescription even though that are supposed to. I was looking to buy some from 1800contacts and did a chat with them, said I could only order the same contacts I get from my doc unless I have their permission.
Weird stuff.
I can vouch for this company:
http://www.1-save-on-lens.com/
You generally just give the online seller the name and address of the doctor. You don't really need to have a copy of the prescription itself.
And no, you won't be able to get any other brand or type of lens other than the one prescribed. I'm not sure why you think that's weird. It's part of the prescription itself.
Just seems strange to me that there's all these different brands of contacts and you can't use different ones without a prescription. I mean if they have the same size and correction numbers why wouldn't you be able to use it?