OPK suggestions

Jenny • 31. Married. TTC #1.

I’ve been using Clearblue Advanced Digital tests that I got on sale and they have somehow lasted 3 months, but not sure I want to pay $40 for the same kit this time. Any recommendations/favorites that are cheaper and preferably on Amazon? Also do most of the cheaper ones just come as strips that you dip and not in a case that you can hold to pee on?

Thanks all!