And there's always eBay which has been great for me when I needed/wanted to buy stuff out of pocket. There's always a little risk something won't work but eBay heavily sides with buyers during disputes.
If you do an eBay search for "Devilries HomeCare Suction Machine Without Battery", you'll find a good deal. And yes, the seller spelled the name of the company wrong. (which is probably why it hasn't sold)
Also, the seller will probably take $95. Just make a Best Offer of $80. Don't ask how I know...
I got the same machine with the built in battery from my DME. It works great but is loud. The one on eBay doesn't have the battery but I don't really use it so...
Rob