I know O.S. Max makes great engines, but:

$339.99 - O.S. Max FS72-a (Tower)
$259.99 - Saito .72 (Horizon)
$259.99 - YS 63s (Central Hobbies)
$209.99 - Thunder Tiger F-75s (Tower)
$179.99 - Magnum XL .70 RFS (Tower)

At $80 more than the Saito .72 or YS 63s and almost double the price of the Magnum XL .70 RFS, I don't know I'll be seeing a lot of these FS72-a four strokes at the local fields. Tower is selling the TT F-75s at well above the regular $169.99 street price, but even at Tower you'll save enough over the O.S. Max FS72-a that you could almost buy an extra .55 AX 2-stroke.

There is a coupon code for $60 off $300 or more right now (01440 for Super Saver members), so $279.99 doesn't seem quite so outrageous for the FS72-a. If Tower has to jack up the prices of their products simply to account for their own coupon/discount promotions, however, I'd suggest that they simply offer fair pricing to begin with.