I keep a modest selection of cellos from 1/4 to full size The smaller size cello are more entry level and get progressively higher in quality with size ( by the time you grow into a bigger cello you want something a bit better). I draw from the Neo, Neo+ and Encore range of Vivo instruments for these and Hidersine instruments for the larger sizes. I keep a few secondhand cellos as well and refurbish factory instruments when i can get them (the price point is quite favourable, has full warranty and i fix whatever flaw they had in them) . I can also order in the fabulous Piacenza and reserve range in about a day which will do most players through high school and into tertiary study of the instrument.
I also keep a range of accessories for Cellos including bows and strings.