thanks for the answer. at banggood:
N1 OSD------- 19,11€
Eachine TS832 RC832 Boscam 5,8G 48CH 600mW FPV Transmissor Receptor Combo AV VTX RX Conjunto 7.4-16V-------22,59€
monitor------ i think i can use the mobile phone.
walkera gimbal-----55,61€
SJCAM-----Action Cam SJ4000 SJCAM WiFi-----60€...