we are looking for refurbished E5515C, OPT:002,003,or both 002/003, GB40 or higher is preferred. and we also need a large quantities of DC power supplies, 66309B/D,66311A/B,66312A,66319B/D. as well as E5071B spectrum analyzer.If you have these products , pls feel free to contact me .You can always talk to me or send me your sales list. Thank you very much! We sincerely looking forward to your reply.