BASS PRO VS CABELLAS ONLINE PURCHASE

[WESTPORTMAFIA]

I ordered a new Aqua Vu Micro Camera system tonight. I opened 4 windows on my computer. 2 were to purchase the item. 1 for Cabelas and 1 from Bass Pro. The other 2 windows were to look for coupon codes. Both stores were $299.00. I found 2 coupons for Bass Pro, free shipping and a $10 dollar gift card. They wouldn't take both promo codes for some reason even though it seemed that it was accepting it. Total cost was $336 -$10 gift card including tax. End result was $326 after the gift card. Then Cabelas had 2 codes that worked, but would only accept 1. Free shipping or $20 off. I took the $20 off which was cheaper than free shipping and paid a final total shipped to my house of $298.94. There was no sales tax with Cabelas. Even if I called Bass Pro and they honored the free shipping with the gift card I still would have paid more. Is this like buying smokes online? Why wasn't I charged sales tax with Cabelas? I'm not complaining as it saved me almost $20 bucks. What gives?