Those D'Addario's are probably as cheap as you will get for some good strings. I got 10 sets of guitar research bass strings for 9.55$ shipped. So like 90 cents a pack. I dont mind them they do the job and sound good for what i play, if i gig more i will be getting better strings .
Purchased 3 sets of hartke extra lights for 30 bones the other day. I like EB and D'addario strings but someone on this forum recomended them and I thought what the hell....Turns out I like how bright they are.I burn through strings in a big way these days and it will save me a small fortune.