Best OPK

Cherie
Hi Ladies 
Long story short.....I am new to the ttc thing. My husband and I got married July 19, 2014. We are going on our honeymoon at the end of November and will be trying for our first then. Per glow and other apps it says I will be ovulating around that week.  
I wanted to get some opk for this month to see if they are correct. What is your favorite to use? 
I know they can also get expensive where is the best place to order/buy them? 
Thank you