I think it's weird that those don't have a brand name.
Are you making sure to have as close to a 4-hour hold as possible? I've found that with cheap sticks I have to make sure I consume very minimal liquids for 3-4 hours before I test or I won't get a test line (or it will be incredibly faint), and sometimes my control line is also very faint that way. I aim for a 3-4 hour hold, and when I'm getting close to O (based on EWcm) I start using digi's along with cheap until I get a +. I have found that a digi will give me a + when my cheap ones aren't clearly + (just close) so I have to be a little flexible with the cheap ones.
IF you are looking for cost effective,check out a couple brands on Amazon. I use "Easy@Home", but have also heard good things about Wondfo. With my Easy@Home I think I got 100 tests (plus 20 pregnancy tests) for $30-40, something like that. You can get a smaller box but I bought it when i was first starting to track and knew I was going to be testing daily (or twice) until I figured out my cycle.