I do not need the 4 channels, I found the rigol being sold by AliExpress but with stock here in Brazil my budget reaches it, as I will use for maintenance any of the three I think would suit me. Rigol here in Brazil being sold for 2,000.00, dso4102c and dso5202p on AliExpress for 1350.00 each outside customs duty if taxed. it would be better to get the rigol soon