Global and Hobby People both have the following prices for Magnum engines advertised in the March 2007 issue of Model Airplane News:

$59.99 - XLS-46A 2-stroke
$89.99 - XLS-61A 2-stroke
$119.99 - XLS-91A 2-stroke

$119.99 - XL-52RFS 4-stroke
$129.99 - XL-70RFS 4-stroke
$149.99 - XL-91RFS 4-stroke

The Global Hobby add, which encourages you to order from your LHS, is on page 1 right inside the cover. The Hobby People ad with the Magnum engine sale prices runs from pages 76 through 79.

I would guess that Hobby People hasn't updated its website pricing yet because they don't expect the ad to be in wide circulation for another week or two.