Error on Silver US coins with an extra 2% off total (even extra products) + free shipping

Hi, bear with me because I have not posted in a long time here. I found a checkout error on coincollectingenterprises.com. Though small company, I've bought from these guys before and they have always delivered and respond to emails.

I saw they sent out a 2% off automatic at checkout discount on 4x silver Roosevelt rolls (https://coincollectingenterprises...ed-sale/). But what I noticed is that if you add this product first, and then add other products, the 2% actually subtracts from your entire order, not just the 4 rolls. So even though there isn't a 2% discount on other products, it works for them anyway.

Their silver pricing is already under typical market pricing. Like https://sdbullion.com/90-percent-silver-100-dollar-face-value-bag​ [sdbullion.com] is $2,040.11 with wire transfer for any random 90% silver and these guys are 1,974.99 for US silver dimes even if you pay by PayPal with a credit card for cash back. Add on the 2% discount and it's very much under any market pricing I've found out there online (and free shipping).

I placed an order over the weekend and it says shipped so looks like they're honoring the deal and they haven't corrected the error yet.
https://coincollectingenterprises...ns/silver/

Personally, I bought the rolls for the discount and then the other sale item https://coincollectingenterprises.com/coin-collection-shop/silver/silver-dimes/silver-roosevelt-dimes/90-silver-roosevelt-dimes-100-face-value-limited-sale/ [coincollectingenterprises.com]

Only caveat is you have to pay be wire or EFT, but that's pretty easy to do these days.

And forgive me on the category. I haven't posted in a long time and wasn't sure what to choose. I just happened to stumble on what seemed like a really nice deal and wanted to share. If you know better deals, please share! I'm always on the look out for solid physical silver deals with people that are legit and deliver.