I understand your desire to save some on optics, but going with one of the cheapest you can find is a BIG mistake. I wouldn't touch a Barska scope with a 10 ft. pole. The only way I'd even bother putting one on a rifle would be if it was given to me, and I wanted to see how fast I could tear it up. I assure you it wouldn't be very long, especially on a .30-06 or larger rifle, many lesser calibers (even .223) have killed Barska scopes, or they come that way from the factory.
Personally, I think $100 is a little bit too little for a scope, but that's just my opinion. My buddy had a Centerpoint scope from Wal-mart, and while it's nothing fancy and not the clearest or brightest glass I've looked through, it did alright. It wasn't like looking through coke bottles, and when we checked zero, it held and dialed the corrections it was supposed to. They come with 1" tubes, so I guess that you wouldn't have to buy new rings. So I guess that's one to consider.
I think another to consider that's on their website is from Pentax. Most people aren't familiar with their scopes, and I'll admit that my experience is limited with them. Either way, I sighted one in for a buddy on a hunting trip, and it tracked perfectly and held zero on a .270. The glass was actually fairly clear, although I'm not sure if he had the model that I'm going to link to you, or a more expensive one. It was in that power range, so I wouldn't be surprised if it was the same scope. It has a 1" tube also, so you wouldn't have to buy rings. I made a hit on a raccoon, cold bore at a touch over 260 yards with that .270 and the Pentax. I don't know over time how it would hold up, but it was decent glass for the money, and seemed to hold zero while we played around with it. I might have to give him a call and see if the scope is still holding up.
http://www.sportsmansguide.com/net/c....aspx?a=502864
The other option that I think you should consider is to spend a bit more money, and get a different scope. The new Redfields seem to be pretty good scopes. Leupold bought them out, and has been trying to put out a reliable, budget scope that has some nice features, but isn't anything fancy. This means that there are few options, but from what I've heard, they're fairly clear, dial how they should, and will stand up to some punishment.
http://www.opticsplanet.net/redfield...e-reticle.html
I can tell you that what will happen when you buy a cheap scope is this. Either it'll die much sooner than it should, and then you'll have to spend the money to replace it with something better. This means you're out of the initial cheap scope you put on it, plus what the new better scope costs. You could just keep using the lifetime warranty on the crappy scopes, but you'll have downtimes where you want to shoot your rifle, but don't have your scope back. If you use the scope for any type of hunting, how unreliable the scope is will really upset you, and probably wound or miss game (hopefully just all together miss). Eventually, even though they'll give you another scope, you'll decide that you don't want to deal with the BS and having to sight your scope in and have it break fairly soon after. Even if you sell the replacement one you got back, it won't take back the shots that you missed on game, or all the ammo that you wasted sighting in the new one. The saying is, "it's better to buy once and cry once", and that's what I think you should do. The funny thing is we're not even talking about spending that much more money to get into MUCH better quality scopes that will actually last and hold zero. They won't be anything fancy or super clear, but they dang sure won't take a $H!T on you when you need it. I recommend that you hold of and save an extra $50-100, and buy a scope in the $150-200 price range. That way your downtime is minimized and you'll end up with something that isn't garbage.