I've heard mixed reviews of Prehistoric Pets. Personally I liked dealing with Kris over at Vital Exotics but he isnt doing stuff anymore really as he is more into his bison farm now. He kept very good records on percents. I would check into Shannon Roepke on FB as she also keeps very good records on the percents. There is also Daniel Solis from Reptile Ave. Bob Clark is another but like Jay Brewer, i have heard mixed reviews about their super dwarf stuff as in they dont keep really accurate records on the percents so i've been told.
Best advice is join the Super Dwarf retic FB pages and check around there. If you are wanting something like a pure SD or high percentage SD, definitely make sure of the percents. Caesar my 37.5% SD, 31.5% dwarf male white tiger het snow is about 7' at about 15 months old and he was rather heavily fed as he was food driven and would destroy his face.
0.1 Rio Bravo Pokigron Suriname BC-Gina
1.0 Meltzer/Lincoln Peruvian Longtail het anery BCL-Louie
0.1 Biak Green Tree Python-Pat 1.0 OSHY Biak Green Tree Python-Alex
0.0.1 Super Reduced Reticulated Gila Monster-Dozer
0.0.1 Utah Banded Gila Monster-Tank
0.0.1 Super Black Beaded Lizard-Reggie