Check out

http://www.hobbybarn.com/

They have great service, great prices, and are very nice people to do business with. I ordered mine on Monday and had it on my door step on Wednesday afternoon. That's with standard UPS shipping.

You won't be sorry with the Irvine 53. I have one and it's the best running engine I ever had. Very eazy to tune, idles like a champ, and has great transition from low to high speed.