Well, I have been shopping at Gumballs for over 10 years, and have found a great many treasure at pretty good prices. A few warnings before you go, however, will help.
Check your receipt before you go. The owner is the only employee, and although she will announce what is on sale (green tags 25% off, all others 75% off etc...) when you walk in the door, she seems to forget this when she rings up your sale. I used to get home and realize she only gave 25% on 75% stuff, or she charged full price on sale items. Now I check my receipt right after she is done. Be aware, though, if she gets caught overcharging you she has a horrible temper. She treated me so poorly the last time I caught her overcharging me that the person in line behind me left without buying anything she had selected.
The owner is knowledgeable about everything in the store, but you have to know beforehand, she is not a conversationalist, and in fact she is rather a grump.
I honestly think that the last time was just too much for me. Her manner is so gruff, and unprofessional I think I will stick with Savers around the corner. The prices are not too much more, it is better organized, and the staff are friendly.