FYI - Lowrance is offering a $50 rebate on HDS-5 models with Lake Insight mapping. The rebate started last week and goes for another month or so. There are also a few other options for savings. More info here - Lowrance HDS-5 $50 Rebate

Using this rebate and a WestMarine coupon code you can save over $100 dollars on the HDS-5 and another $60 on StructureScan.

That's a pretty good deal if the HDS-5 is what you're looking for.