Brian you might try texting him at that number. I get over 100 emails every day and I don't have a business. Can you imagine getting 1000 emails a day with only a small number actually wanting to order? It's easier to take a call for an order plus the fact that you're actually talking to the man who makes them. I appreciate your problem and all I can suggest is texting or getting a hearing impaired phone (I think they are free). At worse start a conversation here with me and I'll find a way to get you in touch with Doug.
Been there done that, I used to run online business myself, but I gave up on ever posting my email address on the website, Instead I put in a web based contact form on website contact page instead of email address (and maintained several email addresses, so I always had one address that very few people know, and doesn't get hit with spam) , which made it far more manageable to go through legit contacts (This was before the CAPTCHA was created, so I had a trick question on the form that only a human could easily answer, so robotic form submitters didn't work either)
As far as the phone device (a TTY - the basic one or a Captel phone- which requires 2 phone lines, BTW) I have had em- but the person on the other end must have and know how to use one too.. Then the Relay service was created so TTY users could call an 800 number, and relay (the third party) would dial the number they wanted to call and "translate" between speech and text the whole conversation (including sound effects!) and then they created the IPRelay (done over the internet via real time chat, AOL used to have that built-in to their AOL-IM) But then that was discovered by scammers that took advantage, eventually it got more and more restrictive.. either way, it is time consuming and tedious - a normal 5 minute phone conversation between 2 hearing people becomes a 30 minute marathon (more or less, depending on the relay operator's ability) - because of that, more and more often, company CSR's started just hanging up or faking some sort of connection problem, and getting rid of those calls without any resolution... Then the ADA law was modified to make that illegal (and relay operators started pointing that out if they had to call back) So, these days I only use Relay if I have no other possible choice, and has taken me as much as 2 to 3 hours to finally resolve an issue that for a normal hearing person might have taken 15 minutes. (I have been dealing with overcoming 95% hearing loss for the last 47 years and counting... so I have used a TTY (battery powered cordless machine was the size, thickness and weight of a dictionary) at honest to goodness rotary dial public pay phones..
However, I see Richard mentions he got Doug's facebook page and message, which would be the game-changer (I don't recall if I noticed Doug's facebook page link on his website, but if it is there, I'd probably use that even before email), so it's all good.