Pure sinewave inverters on Amazon.
http://www.amazon.com/s/?ie=UTF8&keywords=pure+sinewave+inverter&tag=googhydr-20&index=aps&hvadid=14790369564&hvpos=1t1&hvexid=&hvnetw=g&hvrand=13796615785727944003&hvpone=&hvptwo=&hvqmt=e&hvdev=c&ref=pd_sl_4u88j5svuq_e
Now those are fantastic prices. Merlin are local to me... :)