I bought 2 online from Amazon, I think they were $20 a pc. They stretched out in a matter of days.
I just bought one from 1-800-cpap and the quality is so much better. It cost me $30, but worth it. The brand was PureSom by Care Fusion.
I had tried nasal masks, nasal pillows with no luck, The full face masks I have been using all leak. My mouth kept opening even with chin strap.
Last night I used my Dreamwear mask with the NEW chinstrap and I slept 7 1/2 hrs straight, first time in over 4 months. I had a zero leak rate and an Ahi of .25. I only had 2 marks on the event graph.
I may have found my unicorn.