what price would you pay for a gx engine ...a 50amp alternator....60amp ammeter, 60amp switch... a coupling unit... and a machined ally casting to hold the engine and alternator firmly inline (plus all the other nuts bolts , cables ,etc etc) then add your time and vat..now advertize it, and sell it to someone with a 12months guarantee ????.(and of course I assume they need to make a profit to pay some wages etc ).. doing a rough estimate I recon that the price they charge is great value!! Would you really have confidence in purchasing a lawnmower engine coupled to an alternator by a piece of tubing and pulleys on an open angle iron frame.???,...make one out of second hand parts...ok, and you will get something thats cheap..but try and sell it!!!!In passing, the australian unit was being sold in uk at £760.00 when I was considering buying one.