Cheap but accurate.
I bought one because I hadn't been feeling myself (at 8 DPO). I took it randomly in the middle of the night and it said negative so I shoved it back in the box and left it laying on the back of the toilet. Today it fell behind the toilet and out of the box. I looked at it a second time just because and there was a faint positive! I'm currently 13 DPO and my period was due today but I took another test and I'M PREGNANT!
So not only is it cheap, but if you give it enough time, it may even read a very early pregnancy.