The way the ad is written implies that whatever the price as it existed in the WL prior to the "sale" would be reduced by 50%. I think I would have written it more clearly to prevent misunderstanding. The ad does not preclude "sale items" so to me it is reasonable to expect 50% of the sale price, not a complicated calculation of "is it already marked down 30% so this sale only takes another 20% off the price".

Just my $0.02 worth. Thanks for replying so quickly Jenn. :) Mike