From United States Mask, based in Texas, manufactured in the USA:
20 masks for (1.30 ea) $26 after promocode USA for an additional $10 off (thx to dhookup515 for the coupon code)
40 masks for (1.50 ea) $60 with promocode USA for an additional $10 off
Free shipping for a limited time
Just got an email from United States Mask about a limited-time promotion. I'd joined their mailing list after the NY Times article about them. With their current promotion, this seems like a decent deal for a legit N95 mask made in the USA by a Texan company.
3M products are showing up on amazon in this price range (or cheaper), but I don't trust amazon as much regarding counterfeits. With this, you're buying directly from the manufacturer.
NYT on US companies having trouble selling N95 masks:
CDC's certified NIOSH n95 mask list (which lists United States Mask):