where to buy clearblue advanced tests with the weeks estimator?

Mckinzee • Mom of 3 girls. Chloee10/2003, Kallee11/2008, and our rainbow baby Kaydee10/2019

I keep seeing them on here... but CANT FIND THEM IN ANY STORE??? PLEASE HELP. my doctor thinks I'm implanted late so we are trying to figure out how far along I am so we can schedule the ultrasound due to my previous mc. please comment where you bought your test at. I'm going nuts calling stores bugging the workers to find the week estimator tests!