Normal
Well buying from an online breeder is probably the best option around. Half of the time pet stores know little to nothing about the care of what they're keeping, and often times can't even tell you what species it is, or what gender, or what life stage it's at. I can't tell you how many times I've seen mature males being sold in pet stores, often for absurd prices. Most of these are wild caught and kept in poor conditions and don't have long to live anyway. With online breeders, the reliable ones know the exact species they're selling, are pretty good at accurately measuring them, and will often be able to properly identify the gender (if the spider is big enough.) I see no reason not to buy from an online vendor.