first you find the species you want and send a personal message to that person or if they have a email address then you email them and ask how much the mantis is and if there is any extra fees like priority or express shipping and depending on how cheap either is then go with the best option you want when buying them and most people will take paypal or cash or personal checks when you want to buy a mantis or more then one but make sure you ask how they ship them before making any deals and I prefer to send cash or checks when I buy a mantis and paypal is something I dont use and its a personal preference but how you pay is up to you and you give the person you want to buy the mantis from your address if your allowed to do so as some parents wont let their children release personal information such as their home address or anything but always make sure its ok with them first!This pretty much sums up how to purchase a mantis and how to pay for it and so forth!