Dell Inspiron 15 7000 (7559) Gaming Laptop: i5 6300HQ, 15.6″, GTX 960M for $490

This from last week is back in stock
Dell MPP (Member Purchase Program) has the Dell Inspiron 15 7000 Laptop on sale for $538.99 – coupon code april50off = $489.99. Shipping is free.
Inspiron 7559 Specs
Intel Core i5-6300HQ 3.2GHz Quad Core Processor
15.6" 1920×1080 FHD LED-Backlit Display
8GB DDR3L Memory (8GBx1)
1TB Hybrid Hard Drive + 8GB Embedded Flash Cache
Nvidia GeForce® GTX 960M 4GB GDDR5
Intel 3165AC WiFi + Bluetooth 4.0
6-Cell Battery
Windows 10 (64-Bit)
Black w/ Red Accents
Edit: 1. Height: 1 " (25.3mm) | 2. Width: 15.1 " (383mm) | 3. Depth 10.4 " (265mm) | 4. Weight: 5.67lb (2.572 kg) with FHD non-touch)
I can’t seem to get TENOFF to work, it says "This is a valid coupon code, but there are no matching items currently in your cart."
TENOFF page shows this deal in the 10% Off Gaming PCs Starting at $538.99, but the best I can get is the april50off coupon from the last FP thread.