I have almost finished an 80000 word scifi novel, and am looking for beta readers. I don't mind paying $80 or thereabouts as seems to be the rough going rate.
To be frank, if this is only just being finished and it's your first attempt at a novel, I'd suggest you put the beta reader idea on hold for a while. Unless you're a genius, the novel is going to need a good bit of work and possibly several drafts to deal with larger issues of characterisation, character arcs, pace, point of view, story development and the like, and that's if you've edited as you've gone along and have therefore dealt with all the grammar, spelling and continuity errors that can occur in the white heat of first-draft typing.
Rather than use up beta-reader goodwill on this first draft, I'd recommend you leave sending it out until you've gone through the novel at least twice yourself, and I'd further recommend that you don't actually start on the next draft/first editing pass for a few weeks after it's finished. Put it away and let it rest, and you'll be surprised how many obvious errors you pick up that you're at present too close to see. You might then be better off getting into a writing group or having some first/alpha readers to help you on a chapter by chapter basis, before finding people who will read the whole thing straight through.
While you're waiting, have a read around of a few How-to books about the larger issues, if you've not done so already, or even if you have done so. I've found that I'm more able to understand and apply advice from those kinds of books once I've had a go at something -- reading them in advance only serves to confuse me, but afterwards things slot into place a little more.
Also while you're waiting, spend some time looking at the pieces in our Critiques section. You'll see a lot of opening scenes there and a lot of advice which might well be pertinent to your own work. Join in with us on those or other writing threads, and then when you've hit 30 counted posts, perhaps put up the first 500 words of your own novel in Critiques and see how it's received. That will show if there are other immediate issues you need to address in your writing, and also allow others here to see if you're writing the kind of stuff they might be willing to beta read at some point in the future.
Meanwhile, here are some more recent-ish threads about beta reading which might be of interest:
I hope to see you around in the writing threads, but in any event, good luck with your book!
Almost forgot! Hello and Welcome to the Chrons!