Stormer Hobbies carries the Fantom .18 for under $150...currently Out of Stock but I would guess they would have them again soon. I love mine--tons of power and really holds a tune well. It's a drop in replacement for the 2.5TRX and you can re-use all your stock clutch, pipe and engine mount. Probably the only way you'll stay under $150, since there does not seem to be too many hot deals on the OS .18 since they are selling like hotcakes...