Do you ever feel intimidated by head shop (whether it be physical or online), if that shop has a lot of products? I know I do because I am a very indecisive person and having a lot of options gives me a bit of anxiety.
Do you mean that you know what type of glass you want before you go or you have an idea of what you want? I normally don't know what I want before entering a store. I definitely prefer stores that have a smaller inventory that limit my choices.
Buy your glass online at your own speed, without pressure. There are a number of websites that discreetly ship anywhere. Websites like Grasscity.