Comparing Prices

Customers like to compare prices. There is another sundry shop just a short distance away from my husband's shop.

Normally, my customers would tell me that the other shop is selling at a certain price for a certain item. And they would expect me to give them same deal as that. 

But sometimes, I couldn't tell if they were honest enough. Sometimes, they could simply quote their own price so that they will get what they want.

It could be a lie as sometimes after telling me, they still get it from me even though I refused to give that required price..