Where can I buy a clear iPhone 5 case in stores?

My mom's birthday is coming up, and I just came up with the ultimate gift idea! I've seen tutorials on YouTube where you put a picture in a clear phone case, and for Mom i plan on doing that with a copy of an old photo of us when I was little. We both have an iPhone 5. I know I can just order the case online, but I have my reasons to avoid this
-I do not know how to use a credit card and I'm confident I'll do something wrong
-I want this too be a surprise
-That being said there would be a strong chance that mom would find it in the mail
-This is also why I can't just have my mom help me with the online shopping. The only other living thing in our house is a dog.woof:3
Plus I've always preferred shopping in person at a store. Though I my mom and I have ordered cute shoes online before, sometimes something needs to be returned and exchanged. Not the point. Anyways, a store I feel is easier to access and the operation is a bit more simple plus you are more guarantee to receive what you are looking for. The bonus is that it'd be much easier to sneak it past my mom until the big presentation. I hate spoilers.

Go to your local phone shop, they'd definitely would have one!