www.premiumaquatics.com
Under RO/DI plumbing parts, the FVKENT. You could try overnighting it, but it will be expensive. If you do the vacuum thing, just watch it for half a day or even a couple of hours. I doubt you'll have a problem if you make it right.
There are lots of places to get them online (us included), but if you read the message again, he wanted a local source as he didn't have time for mail order.