MaterniT21 $299 “moms helping moms”

I checked with MaterniT21 about price with my insurance, they came back saying i would owe about $400 after insurance. They have a “moms helping moms” initiative where i fill out a questionnaire and this makes my cost $299, regardless of whether insurance pays or not. Have any of you ladies used this? Also it says $299 per test. Is one test considered checking for each individual thing (trisomy13, 18 and 21 each as a separate test?) or all together?

Thanks in advance.