A Magnum .91 is 150 on sale at Hobby People, they have a sale for every holiday. For me a Magnum is a love hate thing, I love the price but don't think much of the quality of the engines. They work pretty well but don't seem to last very long before it's time to rebuild. Still, for the price??? I run 15% POwer Master fuel in everything up to the YS 1.40 and get it on sale at HP for 17 bucks a jug, right now the 20/20 is on sale for 19 beans. It's gone up too high in price so I buy as much as I can when I can get it for this price. I go from sale to sale. I tell my students that if they can afford a good OS or Saito then buy one, if not then take a look at the Magnums. In the two strokes if they can afford it get a trouble free OS AX, if they can't then I have been very happy with the SK line and put several guys into them. I like the SK line as well as the OS engines, I use there .91 and love it.