I don't know if giftmania has this mask. Might want to check it out. He has a shop at the end of bliss street.

Otherwise, if you aren't in a rush, you could try buying it from
Ali Express

You get it way cheaper than anyone would sell here, you could get it within 7 days if you pay for DHL service, otherwise you need to wait for around 15- 20 days for a free delivery and get it from Libanpost.