I ordered my engine kit from gasbike.net.
I got the 48cc Dualstart starfire GT-2 Grubee for $149 + $37shipping. $186 total.
I received my kit in 4-5days right to my door(California to NY).
I payed a cheaper shipping price for UPS and they shipped it Fedex(usually cost more) and they did it for the same price.
Everything was in good shape besides minor stuff.
My engine runs excellant and still starts the first time.
I can cruise around 30mph with a top speed of 35mph and 180+mpg.
I have over 450miles on the engine with all stock parts.
I was happy with there service and ordered again from them,i broke a tab on my carb and ordered another carb and polished intake($38 including shipping) and received that in 6-7days right to my door by Fedex.