IMO, if they are not worth it to you if they end up not laying than I would pass. There are plenty of snakes that will still be laying for many more months, but if they don't at least have some palpable follicles I would not have much confidence that they are going to lay at this point. Also, shipping a snake can also throw them off and they may not end up laying even if there is some follicle growth at the time of shipping. How much are they selling for?