Before ordering through your carrier, check Best Buy’s promotions. The company offers up to $900 off an unlocked Galaxy Z series phone with qualifying trade-ins. Activating your new phone will score you a free case and storage upgrade, plus additional discounts depending on your carrier.

If you’re an AT&T customer, you can trade in any Galaxy phone, no matter how old or broken it is, for either a free Galaxy Z Flip 4 or $1,000 off a Galaxy Fold 4. AT&T is also offering the storage-capacity-upgrade for pre-orders, just like Samsung, plus a free case.

AT&T Business customers also take advantage of pre-order savings. The company is offering both phones at a hefty discount to their enterprise clients. A 356GB Flip 4 is just $499, and the Fold 4 is just $1,299 with a two-year service contract. These prices last from today until August 26.

If you’re a T-Mobile customer, you can get a free Galaxy Z Flip 4 or score $1,000 in bill credits toward a Galaxy Z Fold 4. All you need to do is trade in an eligible device or add a new line on a Magenta MAX plan.

Non-Magenta customers also get a discount with a trade-in or new phone line—up to $500 off the Filp 4 and up to 50% off the Fold 4. All pre-orders through T-Mobile come with a storage upgrade and a free case for the phone.