I have about 10 sets of NYXL guitar strings for sale. These retail for $12.99 each. I'd like to sell them for $90. I don't play the guitar as much as I play bass, and would prefer a trade with Bass Guitar string sets - 4 or 5 string. Prefer a local NYC/Brooklyn trade/sale. Thanks PS: I've opened the packages of two string sets, but haven't used them at all.