Did you try Artesian, Master, Jacuzzi or Coleman?
Depending on where you live there is an Artesian dealers in Manalapan (mine), Northern NJ and one around Ciniminsin. There is also one in PA, I think in Bristol. Niagra Pool and Spas now sells Jacuzzi, maybe they sell Master as well (they did in 2004). If you live north - try Staten Island pools and spas - they sold Master and Emerald in 2004. For Coleman - look at their website but a pool chain carried them in 2004 (I forget their name). As far as D1 - there was a deler in Jackson, NJ that wasn't on the web site and one in PA again around Bristol
You might be looking for the wrong thing in a tub - larger jets tend to be softer on the body, at least from what I remember being said. Maybe look at secondary lines that have possibly smaller jets and when air is added they tend to be more "powerful". I know my tub, an Artesian Cayman, can be really powerful once the air is added.