Visitors to the Forsyth County Public Library’s main branch in Cumming can now walk out with books they can keep.The Friends & Advocates of the library recently opened a used bookstore in a room that’s part of the children’s section.The group will officially welcome the store with a ribbon cutting ceremony at 11 a.m. Saturday.The Friends, which supports library programming, decided to open the store to provide a year-round fundraising source, said spokeswoman Paula Glover.“We do these book sales two to three times a year to raise money for the library,” Glover said. “But we need to be doing more.”The group modeled the idea for a permanent bookstore based on other library support groups, such as the Friends of the Roswell Library, she said.Other such groups have raised “a great deal” by opening a shop, Glover said.The store in the Cumming branch will be open the same hours as the library, she said.Several volunteers will staff the store on a rotating schedule, she said. If none are available, customers can bring their materials to the library’s information desk to purchase.Most books in the store cost 50 cents per paperback or $1 for a hard cover.The store also offers DVDs and narrative CDs, as well as special editions or signed items, which may be priced higher.In the three weeks since opening the door, the store has sold about $1,000 in materials, primarily to library visitors who wandered in.“There’s a lot of interest,” Glover said.