If you have limited resources, it’s possible to get both numbers and why in a hybrid qualitative, quantitative study instead of doing stand-alone qualitative and quantitative studies respectively. Depending on the research objectives, it could be either a survey with a number of open-ended questions built in which would be analyzed and presented with a qualitative approach or an online bulletin board study with over 100 respondents in total across several segments. These are just two examples and there are many more possibilities for creative solutions for cost effective and time efficient study design.