500W Thermaltake Smart Series ATX Power Supply, 80 PLUS Certified: $8 after rebate

Fry’s has the Thermaltake Smart 500W 80 PLUS Certified ATX Power Supply for $8 after a $20 rebate. It is a non-modular model.
https://www.frys.com/product/9063707
That is $19.99 less than the low price found on Amazon ($27.99 with free shipping).
Details:
original price: $37.89
instant Savings: $9.89 (Fri, Nov 23 thru Sat, Nov 24)
price before rebate: $28.00
mail-in rebate: $20.00 debit card
final price: $8.00
limit: 1 per customer
rebate form: https://images.frys.com/art/rebat…TTBF18.pdf
Oddly, the promotional sign was not present next to the items in my local store’s power supply section, where I originally went to pick up the 600W version listed in the Black Friday ad ($13 after $20 rebate). However, another area of the store had an end-cap with the promotional sign and a couple dozen of the 500W models on display.