The unlocked Galaxy S6 has experienced another price drop on eBay Daily Deals. Now you can get this device for just $529.99. That's $50 less than last time and more than $100 off the retail price.

2015-06-18 16_13_15-New Samsung Galaxy S6 SM G920F 32GB GSM Unlocked 16MP Smartphone _ eBay

You can only get the phone in black from this deal, but it should work fine on any North American GSM/LTE network. It has all the LTE bands you'd need on AT&T, and it has bands 2 and 12 for T-Mobile in addition to the usual AWS. It doesn't have T-Mobile's main HSPA+ band, but you'll still get 3G in areas that are included in the 1900MHz re-farm.

Shipping is free in the US, and there are (expensive) international options available.