Hi NYParamedic,
Hello back and welcome … and I’m glad you found us 
Dreamfoam and Brooklyn Bedding are sister companies that make different lines of mattresses (see post #4 here and post #3 here) although there are a few such as the Total Latex Mattress or the Aloe Alexis where they overlap and the same mattress is available through both companies.
Outside of the few that are sold by both companies … the Brooklyn Bedding mattresses are only available from the Brooklyn Bedding site.
The Dreamfoam mattresses though are available through 3 different purchase channels but the mattresses are the same with each of them.
All of their mattresses are listed on their Amazon site (in this view and/or this view) and can be purchased with Dreamfoam fulfillment (vs Amazon fulfillment). Dreamfoam fulfilled mattresses don’t have a return policy although some of them have layer exchanges that allow you to replace the comfort layer with a different firmness level. The forum members here also quality for a pillow bonus for any of their mattresses that are purchased through Amazon and fulfilled by Dreamfoam.
Some of their more popular mattresses and sizes are available with Amazon fulfillment which means that they can be returned through the Amazon large items return policy (see post #11 here) and are eligible for Amazon prime 2 day shipping but the price is higher than the same mattress fulfilled by Dreamfoam and they don’t have a pillow bonus.
All of their mattresses are also available through the Dreamfoam Bedding site (which is a relatively new option) although all of them aren’t listed there so you would need to call them to order the ones that aren’t listed. Orders on their own site also come with a pillow bonus unless there is a special discount in effect. There is currently a 10% discount available (see their facebook page here) which can’t be combined or “stacked” with the pillow bonus. Orders from the Dreamfoam site also have a 45 day comfort guarantee (see the bottom right corner of their page).
An order through their own site with the current 10% discount would probably be the best combination of price and return options out of the three different Dreamfoam purchase channels.
Phoenix