If memory serves you can get a Saito 82 for about 250 and a Saito 125 for 340.00. I have no idea why OS is pricing their 81 so high. I prefer Saito to OS anyway.

[Please don't jump me you OS fans (:-). I have both brands in my planes.]

Donald's Hobby Center always seems to have good prices on engines. He's not always rigid on his prices so don't hesitate to bargain with him.