So i tried this on mobile late last night and it seemed to work; it just looked like some of the figures worked with the glitch and some didn't. I personally found the "light fx" Vader and Ren figures wouldn't work, but the regular ones did. Ultimately placed an order for Obi Wan($4), and (free) Darth Maul, Darth Vader, Kylo Ren and Venom; with tax and shipping, it came to $11.33, and i paid with Paypal. Got my e-mail confirmation from Paypal, and my confirmation/order number from TRU, and everything seemed kosher.
Then i woke up this morning and had another order confirmation from TRU, with the same order number, but the new total read $18.55, and when i tried to access the order, it came up as invalid. Guessing they caught the glitch, then tried to revise the total and charge my card extra, but when they realized i'd paid through Paypal and they couldn't do that, they just canceled the entire order. Charge still says "pending" on Paypal website, but at this point i don't expect that charge will ever actually go through.
I'd recommend anyone who tried to take advantage of this and paid with credit pay close attention to the charge on their card to make sure TRU didn't try to "update" the total after the order was complete and charge them extra. At this point, they may just end up canceling all the glitched orders.