We visited RR in Jan to see the new resort. I thought the store was on the small side when compared to other DVC resort stores. The prices tend to be high but you are at Disney which overall has pricing on the high side so no surprise there.
We now drive to WDW and bring groceries from home. When we flew down we always brought a suitcase with snack items, coffee, coffee filters, tea, etc. and a small insulated lunch box with cold things like cream cheese, frozen bagels, block cheese, lime juice and anything else I though we might need. This worked out very well and on the return trip I had a pretty empty suitcase for anything I purchased while at WDW.