Is it worth it to go to an MBA career fair when I don't have an MBA?

It depends on what companies are attending this career fair, but if they're primarily finance or consulting firms, when you approach the company booths, you will most likely be asked from where/when you obtained your MBA, and when you reply in the negative, they will bid you good day. I highly doubt it's worth the $70 fee (that's a new one for me: fee-based career fairs). Is the very slim chance of talking to an HR representative only to be turned away worth $70 to you?

Mutant has it. I was going to have you go and get the list yourself, but Mutant has a more efficient option. That isn't to say that if you are a good talker and are good at making contact with people you shouldn't go, get relevant catalogs and brochures from the stalls, and gather names and such. If I were going I'd look my absolute best, bring CVs, recommendation contacts and cards, go at a SLOW time, go up to firms that did a cool thing I was interested in/informed about and chat up the folks at the tables about the cool thing. I'd acknowledge right up front, slightly sheepishly, that I wasn't an MBA but was workig hard on getting a job, and was thus wondering about hiring for non-MBA opportunities or at least wondering if they'd be headed to a career fair aimed at my qualification level soon. If nothing else, 70 bucks is a good investment for career fair/interview/networking practice at relatively low risk to you.

It'll be worth it if you are prepared to work the room and talk to absolutely everyone. Be prepared for 99.9% rejection, but then again, you only need 1 person to listen.

A recent BioScience career fair rejected me right away for not having sufficient industry experience (as in, you're not allowed to attend). I somehow ended up on their mailing list anyway, and got a couple of emails apologizing for the enormous lines and crowded spaces as the turnout was so immense. I'm mentioning that in order to say that it might be a better idea to save your $70 right now, especially if you're not technically qualified. Besides, who charges the job applicants to attend career fairs?!

Thanks to everyone who responded. All your answers were helpful. FWIW, I think career fairs where job applicants have to pay are usually tied to the national conferences of professional organizations. The Society of Women Engineers career fair was. So is this one (for the Asian MBA association).