Your right pet shops are bad at this.and it makes me sick,But all the blame cant be put on them.There are adults that think you just chuck them in a tank,with out researching there needs.They buy them as babies and think how cute.As they get older their not so cute as they require bigger tanks,good filters heat lamp and uvb lamps and cleaning.Sorry im hot under the collar over this.I have taken in a couple of turtles,that have not had their requirements met.One stunted and badly pitted shell.The other lumpy shell,old shutes not shed.