Hi Melissa. Does that mean you're paying about $45-50 pre-tax, including your tab? That means even at $50 pre-tax including your tab, unless you're in Quebec, probably doesn't meet the tab medium requirement (plus given the sales tax in Quebec, you'd probably still have to bump up your monthly bill a little).
You often have the option of paying more up-front to go on a smaller tab.
Expect the Galaxy S7 to go down in price on Koodo come November/December this year. They might even have good deals rolling into August/September for back to school.
For your choice of phone, I'd avoid the S7. Same generation as the Note 7, many users have reported that the device overheats. More ppl have reported satisfaction with the LG G5. If you wait until Back to School or Black Friday, you may even get the same deal on the LG G6. Also consider that Koodo has the best selection of Motorola's among the subsidiaries (vs. Virgin & Fido), which should not be overlooked :D
As for going elsewhere, with Télus/Bell/Rawgers, you might pay less upfront, but will very likely pay more per month on your plan.
I suppose OP could pay $364 up-front, go on a tab small, plus buy-out their current tab, or order a Galaxy S7 on eBay for $410, plus it'd be unlocked. eBay seems to be the obvious choice at the time of writing for the Galaxy S7.
I spoke to two individuals who sent in their Galaxy S7's for overheating and opted for the Google Pixel once they got their money from the protection plan. I've also heard from someone else about reports of the S7 putting homes on fire. As I am not a big Samsung or LG fan, it'd be hard for me to decide whether to go with S7 or G5 but they happen to be the big brands that most Android users go for.
I would recommend upgrading to something better given that the LG G3 is showing its age now. I think it's time to retire the 2014 phones :D