Buying plant liners at a cheaper price

I am planning to buy some plastic liners in a store of my co-gardener named Vicky at the Tiangge. She is selling different sizes of plastic containers at a reasonable price. There are two store owners here in my town that sell the same items but I prefer to buy to Vicky because she offers a lower price than my other gardener friend. They both have same source. I have plenty of plants that needs to be transferred into a bigger containers because they don't have enough room for growing. It is much better if I can transfer the plant earlier than to transfer it when the roots are coiled already.